Pressure test device of melt multi-way valve

Abstract

The utility model discloses a pressure test device of a melt multi-way valve, and relates to the technical field of non-standard valve performance detection. The piston type plug assembly is used for being detachably installed in and plugging an inlet pipe or an outlet pipe of the melt multi-way valve. The clamp assembly is used for being locked to the step of the outer wall of the inlet pipe or the outlet pipe and is in axial limiting fit with the piston type plug assembly. The first closed threaded pipe cap assembly is used for being detachably connected with the piston type plug assembly. The thermal insulation sleeve test unit comprises a joint type threaded pipe cap assembly and a second closed type threaded pipe cap assembly; the connector type threaded pipe cap assembly is used for being detachably connected with a heating medium connecting pipe on a valve heat preservation sleeve to form a pressure conveying connector. The second closed type threaded pipe cap assembly is used for being detachably connected with other heating medium connecting pipes on the valve heat preservation sleeve so as to achieve blocking. A traditional sealing head welding mode is effectively abandoned, input of welding cost and subsequent machining cost is avoided, and meanwhile influence and damage to the valve body are eradicated.

Description

Technical Field

[0001] This application relates to the field of non-standard valve performance testing technology, and in particular to a pressure testing device for a melt multi-way valve. Background Technology

[0002] Non-standard valves used in pipelines of fertilizer, textile and chemical industry polyester, and spinning equipment have different shapes and are connected to the chemical pipeline system by welding. When testing the pressure performance of melt multi-way valves, the traditional method is to seal the valve inlet / outlet pipes with welded heads before conducting the test.

[0003] However, this method of testing with welded end caps has many drawbacks: First, the welding process itself requires a high cost, and after the test, large processing equipment is needed to restore the valve's inlet / outlet pipes to normal operating condition, further increasing processing costs; Second, when users need to re-inspect the valve's performance, the method of welding end caps is cumbersome and inconvenient; Third, if the same part of the valve is repeatedly welded, it will cause the metal grains inside the heat-affected zone of the weld joint to coarsen, significantly reducing the toughness of the joint and decreasing the fatigue strength of the joint, thus seriously affecting the quality and performance of the valve product. Utility Model Content

[0004] This application provides a pressure testing device for a melt multi-way valve, which solves the problems mentioned in the background art.

[0005] This application provides a pressure testing device for a melt multi-way valve, including a main cavity test unit for pressure testing the main cavity of the valve, an insulation sleeve test unit for pressure testing the insulation sleeve cavity of the valve, and a pressure delivery unit for supplying test medium and pressurizing the main cavity test unit and the insulation sleeve test unit. The main cavity test unit includes a piston plug assembly, a clamp assembly, and a first closed threaded cap assembly. The piston plug assembly is used to detachably insert into and seal the inlet or outlet pipe of the melt multi-way valve. The clamp assembly is used to lock onto the step on the outer wall of the inlet or outlet pipe and axially limit the piston plug assembly. The first closed threaded cap assembly... The threaded cap assembly is detachably connected to the piston-type plug assembly to seal the main cavity of the valve. The insulation sleeve test unit includes a connector-type threaded cap assembly and a second closed-type threaded cap assembly. The connector-type threaded cap assembly is detachably connected to a heat medium connection pipe on the valve insulation sleeve to form a pressure delivery interface. The second closed-type threaded cap assembly is detachably connected to the remaining heat medium connection pipes on the valve insulation sleeve to achieve sealing. One end of the pressure delivery unit is detachably connected to the test pump, and the other end can be selectively detachably connected to the piston-type plug assembly or the connector-type threaded cap assembly to deliver test medium and pressurize the main cavity of the valve or the cavity of the valve insulation sleeve, respectively.

[0006] In one possible implementation, the piston-type plug assembly includes a plug, an O-ring, and an injection tube; the outer wall of the plug is provided with an annular sealing groove, and the O-ring is installed in the annular sealing groove; a threaded hole is axially formed in the middle of the plug; one end of the injection tube is provided with a first external thread section for threaded connection with the threaded hole of the plug; the other end of the injection tube is provided with a second external thread section; a hexagonal wrench position is provided on the outer wall of the injection tube near the second external thread section; an injection hole is axially formed through the injection tube, and the outlet end of the injection hole is located at the end face of the second external thread section and forms a first sealing cone surface.

[0007] In one possible implementation, the clamp assembly includes two symmetrically arranged semi-circular clamp bodies, a fastening plate, and a retaining ring. The two semi-circular clamp bodies, when joined together, form an annular clamp. One end of each semi-circular clamp body is fixedly connected to the corresponding fastening plate. The two fastening plates have corresponding locking holes for fasteners to pass through. The inner wall of the annular clamp is sequentially provided with a first annular groove, a second annular groove, and a third annular groove that communicate with each other. The first and second annular grooves are used to engage with the steps on the outer wall of the valve inlet or outlet pipe. The end of the injection pipe away from the plug passes sequentially through the first, second, and third annular grooves. The retaining ring is accommodated within the input port of the valve inlet pipe or the output port of the outlet pipe, with one side abutting against the second annular groove of the clamp assembly and the other side abutting against the end face of the plug.

[0008] In one possible implementation, the first closed threaded cap assembly includes a first threaded cap and a first sealing ring; one end of the first threaded cap is provided with a first internal thread, and the outer wall of the other end is provided with a first external hexagonal wrench; the first sealing ring is disposed inside the first threaded cap and is used to abut against the end of the injection pipe away from the plug; the first threaded cap is threadedly connected to the second external thread section of the injection pipe through the first internal thread to achieve sealing.

[0009] In one possible implementation, the connector-type threaded pipe cap assembly includes a pipe cap and a perforated sealing gasket; one end of the pipe cap is provided with a second internal thread for connecting to the heat medium pipe of the valve insulation sleeve; the outer wall of the other end is provided with a second external hexagonal wrench and a third external thread section in sequence; a through hole is provided through the middle of the pipe cap, and the end face of the pipe cap with the third external thread section forms a second sealing cone surface communicating with the through hole; the perforated sealing gasket is used to be disposed between the end face of the pipe cap and the heat medium pipe of the valve insulation sleeve.

[0010] In one possible implementation, the pressure delivery unit includes a pressure delivery hose and a quick-connect fitting assembly disposed at at least one end of the pressure delivery hose; the quick-connect fitting assembly includes a fitting body and a union nut; the union nut is fitted onto the fitting body and has a third internal thread on its inner wall; one end of the fitting body is used to connect to the pressure delivery hose, and the other end is provided with a sealing portion; when the quick-connect fitting assembly is connected to the piston-type plug assembly, the sealing portion mates with the first sealing cone surface; when connected to the connector-type threaded cap assembly, the sealing portion mates with the second sealing cone surface; the third internal thread is used for threaded connection with the second external thread section of the injection pipe or the third external thread section of the cap; by tightening the union nut, the sealing portion is pressed against the corresponding first or second sealing cone surface to form a seal.

[0011] One or more technical solutions provided in the embodiments of this application have at least the following technical effects:

[0012] The pressure testing device for a melt multi-way valve provided in this application, through the design of a main cavity testing unit consisting of a piston-type plug assembly, a clamp assembly, and a first closed threaded cap assembly, and an insulation sleeve testing unit consisting of a joint-type threaded cap assembly and a second closed threaded cap assembly, in conjunction with a universal pressure delivery unit, achieves rapid and reliable sealing and pressure testing of the valve's main cavity and insulation sleeve cavity. This device effectively avoids the traditional method of welding the end cap; all connections are detachable. This not only avoids the high costs, cumbersome operation, and quality risks associated with welding, such as performance degradation in the heat-affected zone caused by repeated welding, but also enables rapid assembly, disassembly, and reuse of the testing device. This greatly improves the convenience and economy of valve factory inspection, user re-inspection, and maintenance testing, effectively ensuring the long-term performance and reliability of the valve product. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the pressure testing device for the melt multi-way valve provided in the embodiments of this application;

[0015] Figure 2 This is a schematic diagram of the structure of the plug provided in an embodiment of this application;

[0016] Figure 3 This is a schematic diagram of the structure of the O-ring provided in the embodiments of this application;

[0017] Figure 4 This is a schematic diagram of the injection tube provided in an embodiment of this application;

[0018] Figure 5 This is a schematic diagram of the structure of the semi-circular ring clamp provided in the embodiments of this application;

[0019] Figure 6 This is a schematic diagram of the structure of the fastening plate provided in the embodiments of this application;

[0020] Figure 7 This is a schematic diagram of the structure of the retaining ring provided in an embodiment of this application;

[0021] Figure 8This is a schematic diagram of the structure of the first threaded cap provided in an embodiment of this application;

[0022] Figure 9 This is a schematic diagram of the structure of the first sealing ring provided in an embodiment of this application;

[0023] Figure 10 This is a schematic diagram of the structure of the cap provided in the embodiments of this application;

[0024] Figure 11 This is a schematic diagram of the structure of the perforated sealing gasket provided in the embodiments of this application;

[0025] Figure 12 This is a schematic diagram of the structure of the pressure delivery hose provided in the embodiments of this application;

[0026] Figure 13 This is a schematic diagram of the structure of the inlet pipe provided in an embodiment of this application.

[0027] Icons: 1-Main cavity test unit; 11-Piston-type plug assembly; 111-Plug part; 1111-Annular sealing groove; 1112-Threaded hole; 112-O-ring seal; 113-Injection pipe; 1131-Hex wrench position; 1132-First external thread section; 1133-Second external thread section; 1134-Injection hole; 1135-First sealing cone surface; 12-Clamp assembly; 121-Semi-circular ring clamp body; 122-Fastening plate; 123-Retaining ring; 13-First closed threaded pipe cap assembly; 131-First threaded pipe cap; 1311-First internal thread; 1312-The 1. External hexagonal wrench; 132-First sealing ring; 2-Insulation sleeve test unit; 21-Joint type threaded pipe cap assembly; 211-Pipe cap; 2111-Second internal thread; 2112-Second external hexagonal wrench; 2113-Third external thread section; 2114-Through hole; 2115-Second sealing cone surface; 212-Perforated sealing gasket; 22-Second closed threaded pipe cap assembly; 3-Pressure transmission unit; 31-Pressure transmission hose; 32-Joint body; 33-Union nut; 331-Third internal thread; 4-Inlet pipe; 5-Outlet pipe; 6-Valve main cavity; 7-Valve insulation sleeve cavity. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0030] This application provides a pressure testing device for a melt multi-way valve, such as... Figures 1 to 13 As shown. The pressure testing device for the melt multi-way valve includes a main cavity test unit 1 for pressure testing the main cavity 6 of the valve, an insulation sleeve test unit 2 for pressure testing the insulation sleeve cavity 7 of the valve, and a pressure delivery unit 3 for supplying and pressurizing the test medium to the main cavity test unit 1 and the insulation sleeve test unit 2. The main cavity test unit 1 includes a piston plug assembly 11, a clamp assembly 12, and a first closed threaded cap assembly 13. The piston plug assembly 11 is used to detachably insert into and seal the inlet pipe 4 or outlet pipe 5 of the melt multi-way valve. The clamp assembly 12 is used to lock onto the step on the outer wall of the inlet pipe 4 or outlet pipe 5 and is axially limited in fit with the piston plug assembly 11. The first closed threaded cap assembly 13 is used to detachably connect to the piston plug assembly 11 to achieve closure of the main cavity 6 of the valve. The insulation sleeve test unit 2 includes a joint-type threaded cap assembly 21 and a second closed threaded cap assembly 22. The connector-type threaded cap assembly 21 is used for detachable connection to a heat medium connection pipe on the valve insulation sleeve to form a pressure delivery interface. The second closed-type threaded cap assembly 22 is used for detachable connection to the remaining heat medium connection pipes on the valve insulation sleeve to achieve sealing. One end of the pressure delivery unit 3 is used for detachable connection to the test pump, and the other end can be selectively detachably connected to the piston-type plug assembly 11 or the connector-type threaded cap assembly 21, for delivering test medium and pressurizing it to the valve main cavity 6 or the valve insulation sleeve cavity 7, respectively.

[0031] The pressure testing device for a melt multi-port valve provided in this application, through the design of a main cavity test unit 1 consisting of a piston-type plug assembly 11, a clamp assembly 12, and a first closed threaded cap assembly 13, and an insulation sleeve test unit 2 consisting of a joint-type threaded cap assembly 21 and a second closed threaded cap assembly 22, in conjunction with a universal pressure delivery unit 3, achieves rapid and reliable sealing and pressure testing of the valve's main cavity 6 and the valve's insulation sleeve cavity 7. This device effectively avoids the traditional method of welding the end cap; all connections are detachable. This not only avoids the high costs, cumbersome operation, and quality risks associated with welding, such as performance degradation in the heat-affected zone of the valve body due to repeated welding, but also enables rapid assembly, disassembly, and reuse of the test device. This greatly improves the convenience and economy of valve factory inspection, user re-inspection, and maintenance testing, effectively ensuring the long-term performance and reliability of the valve product.

[0032] In this embodiment, the piston-type plug assembly 11 includes a plug 111, an O-ring seal 112, and an injection tube 113. The outer wall of the plug 111 is provided with an annular sealing groove 1111, and the O-ring seal 112 is installed within the annular sealing groove 1111. A threaded hole 1112 is axially formed in the middle of the plug 111. One end of the injection tube 113 is provided with a first external thread section 1132 for threaded connection with the threaded hole 1112 of the plug 111. The other end is provided with a second external thread section 1133. A hexagonal wrench position 1131 is provided on the outer wall of the injection tube 113 near the second external thread section 1133. An injection hole 1134 is axially formed through the injection tube 113, and the outlet end of the injection hole 1134 is located on the end face of the second external thread section 1133, forming a first sealing cone surface 1135.

[0033] It should be noted that the plug 111 achieves radial sealing with the inner wall of the inlet pipe 4 or outlet pipe 5 through its annular sealing groove 1111 on its outer wall and the O-ring 112 installed inside; its axially opened threaded hole 1112 is threadedly connected to the first external thread section 1132 of the injection pipe 113, forming a stable component body. The hexagonal wrench position 1131 provided on the injection pipe 113 facilitates assembly operations, and its through injection hole 1134 forms a pressure medium delivery channel; the outlet end of this delivery channel is located at the end face of the second external thread section 1133 and forms a first sealing cone surface 1135, which can cooperate with the connector body 32 of the pressure delivery unit 3 to form an end face seal, while the second external thread section 1133 itself provides a standardized interface for connecting the pressure delivery unit 3 or the first closed threaded cap assembly 13. The entire component has a compact structure, realizing quick assembly and disassembly, reuse, and reliable sealing, providing an effective alternative to traditional welding sealing methods.

[0034] In this embodiment, the clamp assembly 12 includes two symmetrically arranged semi-circular clamp bodies 121, a fastening plate 122, and a retaining ring 123. The two semi-circular clamp bodies 121, when engaged, form an annular clamp. One end of each semi-circular clamp body 121 is fixedly connected to the corresponding fastening plate 122. Locking holes for fasteners to pass through are correspondingly provided on the two fastening plates 122. The inner wall of the annular clamp is sequentially provided with a first annular groove, a second annular groove, and a third annular groove that communicate with each other. The first and second annular grooves are used to engage with the steps on the outer wall of the valve inlet pipe 4 or outlet pipe 5. The end of the injection pipe 113 away from the plug 111 passes sequentially through the first annular groove, the second annular groove, and the third annular groove, so that the second external thread section 1133 and the first sealing cone surface 1135 of the exposed end of the injection pipe 113 are located outside the annular clamp, thereby achieving precise docking and sealing connection with external components (the quick-connect coupling assembly of the pressure transmission unit 3 or the first closed threaded cap assembly 13). The retaining ring 123 is housed in the input port of the valve inlet pipe 4 or the output port of the outlet pipe 5, with one side abutting against the second annular groove of the clamp assembly 12 and the other side abutting against the end face of the plug 111.

[0035] In this embodiment, the first closed threaded cap assembly 13 includes a first threaded cap 131 and a first sealing ring 132. One end of the first threaded cap 131 is provided with a first internal thread 1311, and the outer wall of the other end is provided with a first external hexagonal flange 1312. The first sealing ring 132 is disposed inside the first threaded cap 131 and is used to abut against the end of the injection pipe 113 away from the plug 111. The first threaded cap 131 is threadedly connected to the second external thread section 1133 of the injection pipe 113 via the first internal thread 1311 to achieve a seal.

[0036] Specifically, the second closed threaded cap assembly 22 has the same structure as the first closed threaded cap assembly 13, including a second threaded cap and a second sealing ring. One end of the second threaded cap is provided with a fourth internal thread for detachable connection with the external thread of the heat medium connection pipe of the valve insulation sleeve, and the outer wall of the other end is provided with a third external hexagonal wrench for easy installation and removal with a wrench. The second sealing ring is located inside the second threaded cap and is used to abut against the end face of the heat medium connection pipe of the valve insulation sleeve. The second threaded cap is threadedly connected to the heat medium connection pipe through the fourth internal thread. After tightening, the second sealing ring is pressed to achieve sealing of the heat medium connection pipe. Its structural parameters and assembly method are matched with the first closed threaded cap assembly 13 and are suitable for heat medium connection pipes of corresponding specifications.

[0037] In this embodiment, the threaded cap assembly 21 includes a cap 211 and a perforated sealing gasket 212. One end of the cap 211 has a second internal thread 2111 for connection to the heat transfer medium connection of the valve insulation sleeve. The outer wall of the other end has a second external hexagonal flange 2112 and a third external thread section 2113. A through hole 2114 is provided through the middle of the cap 211, and the end face with the third external thread section 2113 forms a second sealing cone surface 2115 communicating with the through hole 2114. The perforated sealing gasket 212 is positioned between the cap 211 and the end face of the heat transfer medium connection of the valve insulation sleeve. This design allows for independent and convenient pressure testing of the valve insulation sleeve cavity 7 without modification of the pipe body, effectively improving testing efficiency and operational convenience.

[0038] In this embodiment, the pressure delivery unit 3 includes a pressure delivery hose 31 and a quick-connect fitting assembly disposed at at least one end of the pressure delivery hose 31. The quick-connect fitting assembly includes a fitting body 32 and a union nut 33. The union nut 33 is sleeved on the fitting body 32, and its inner wall is provided with a third internal thread 331. One end of the fitting body 32 is used to connect to the pressure delivery hose 31, and the other end is provided with a sealing part. When the quick-connect fitting assembly is connected to the piston-type plug assembly 11, the sealing part mates with the first sealing cone surface 1135. When connected to the connector-type threaded cap assembly 21, the sealing part mates with the second sealing cone surface 2115. The third internal thread 331 is used to thread-connect with the second external thread section 1133 of the injection pipe 113 or the third external thread section 2113 of the cap 211. By tightening the union nut 33, the sealing part is pressed and sealed with the corresponding first sealing cone surface 1135 or second sealing cone surface 2115.

[0039] Specifically, the sealing part is a spherical sealing surface to ensure a reliable seal with the first sealing cone surface 1135 or the second sealing cone surface 2115. The interface of the pressure testing pump also adopts a structure adapted to the quick-connect coupling assembly to achieve quick and detachable connection.

[0040] The pressure test method for melt multi-way valves shall be carried out according to the following steps:

[0041] S1: Experiment Preparation

[0042] Installation of Main Chamber Test Unit 1: The piston-type plug assembly 11 is installed into each inlet pipe 4 and outlet pipe 5 of the valve, and its O-ring seal 112 is used to achieve sealing. Subsequently, the clamp assembly 12 is installed at the step on the outer wall of each inlet pipe 4 or outlet pipe 5. The annular clamp is tightened into the step by tightening the fasteners, and at the same time, the retaining ring 123 is axially pressed against the end face of the piston-type plug assembly 11 to achieve its mechanical axial fixation.

[0043] Installation of insulation sleeve test unit 2: Among the various heat medium connections of the valve insulation sleeve, select one installation joint type threaded pipe cap assembly 21 and use it with a perforated sealing gasket 212 as a pressure transmission interface, and seal the remaining heat medium connections using the second closed type threaded pipe cap assembly 22.

[0044] S2: Valve main cavity 6 pressure test

[0045] Valve seat sealing test (i.e., testing the sealing performance of the valve's internal closing element): Close the valve disc. Connect one end of the pressure delivery hose 31 of the pressure delivery unit 3 to the test pump, and the other end to the second external thread section 1133 of a piston plug assembly 11 via a union nut 33 and seal it. Start the test pump to increase the pressure to the specified test pressure and maintain the pressure. Detect the valve's sealing performance in the closed state by observing whether there is media leakage through the injection holes 1134 of the remaining piston plug assemblies 11.

[0046] Shell strength test: Open the valve disc. Use the first closed threaded cap assembly 13 to seal all piston plug assemblies 11 that are not connected to the pressure delivery hose 31. Pressurize the valve main cavity 6 again through the pressure delivery hose 31 to the specified test pressure, maintain the pressure, and check the valve shell for leaks or deformation.

[0047] S3: Pressure test of valve insulation sleeve 7

[0048] Insulation jacket strength test: Confirm that all interfaces of the valve insulation jacket cavity 7 are sealed. Connect one end of the pressure delivery hose 31 to the test pump, and the other end to the third external thread section 2113 of the connector-type threaded cap assembly 21 via the union nut 33 and seal it. Start the test pump to pressurize the valve insulation jacket cavity 7 to the specified test pressure, maintain the pressure, and check for leaks.

[0049] S4: Test Completion and Disassembly

[0050] After all tests are completed, the system is completely depressurized.

[0051] Disassemble the pressure delivery unit 3, the first closed threaded cap assembly 13, the second closed threaded cap assembly 22, the connector-type threaded cap assembly 21, the clamp assembly 12, and the piston-type plug assembly 11 in sequence. The valve is then restored to a usable installation state.

[0052] It is evident that this method employs mechanical connections throughout, eliminating the need for welding. It offers advantages such as quick assembly and disassembly, no damage to the valve body, and reusability, thereby improving the efficiency of pressure testing and the convenience of re-inspection.

[0053] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0054] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A pressure testing device for a melt multiple valve, characterized by, It includes a main cavity test unit (1) for pressure testing of the main cavity of the valve (6), an insulation sleeve test unit (2) for pressure testing of the insulation sleeve cavity of the valve (7), and a pressure delivery unit (3) for delivering test medium and pressurizing the main cavity test unit (1) and the insulation sleeve test unit (2). The main cavity test unit (1) includes a piston plug assembly (11), a clamp assembly (12), and a first closed threaded cap assembly (13); the piston plug assembly (11) is used to detachably insert into and seal the inlet pipe (4) or outlet pipe (5) of the melt multi-way valve; the clamp assembly (12) is used to lock onto the step on the outer wall of the inlet pipe (4) or outlet pipe (5) and to axially limit the piston plug assembly (11); the first closed threaded cap assembly (13) is used to detachably connect with the piston plug assembly (11) to achieve the closure of the valve main cavity (6); The insulation sleeve test unit (2) includes a joint-type threaded pipe cap assembly (21) and a second closed-type threaded pipe cap assembly (22); the joint-type threaded pipe cap assembly (21) is used to detachably connect to a heat medium pipe on the valve insulation sleeve and form a pressure transmission interface; the second closed-type threaded pipe cap assembly (22) is used to detachably connect to the remaining heat medium pipes on the valve insulation sleeve to achieve sealing; One end of the pressure delivery unit (3) is detachably connected to the test pump, and the other end is selectively detachably connected to the piston plug assembly (11) or the connector threaded cap assembly (21) to deliver test medium and pressurize the valve main cavity (6) or the valve insulation sleeve cavity (7) respectively.

2. The pressure testing apparatus for a melt multiple valve according to claim 1, characterized by The piston-type plug assembly (11) includes a plug (111), an O-ring (112), and an injection tube (113). The outer wall of the plug (111) is provided with an annular sealing groove (1111), and the O-ring (112) is installed in the annular sealing groove (1111); the plug (111) is provided with a threaded hole (1112) along the axial direction in the middle part. One end of the injection tube (113) is provided with a first external thread section (1132) for threaded connection with the threaded hole (1112) of the plug (111); the other end of the injection tube (113) is provided with a second external thread section (1133). The outer wall of the injection tube (113) is provided with a hexagonal wrench position (1131) near the second external thread section (1133). The injection tube (113) has an injection hole (1134) extending through it axially. The outlet end of the injection hole (1134) is located on the end face of the second external thread section (1133) and forms a first sealing cone surface (1135).

3. The pressure testing apparatus for a melt multiple valve according to claim 2, wherein The clamp assembly (12) includes two symmetrically arranged semi-circular clamp bodies (121), a fastening plate (122), and a retaining ring (123). The two semi-circular ring clamps (121) are joined together to form a ring clamp. One end of each semi-circular ring clamp (121) is fixedly connected to the corresponding fastening plate (122). The two fastening plates (122) are respectively provided with locking holes for fasteners to pass through. The inner wall of the annular clamp is provided with a first annular groove, a second annular groove and a third annular groove that are interconnected. The first annular groove and the second annular groove are used to snap onto the step on the outer wall of the valve inlet pipe (4) or outlet pipe (5); the end of the injection pipe (113) away from the plug (111) passes through the first annular groove, the second annular groove and the third annular groove in sequence; the retaining ring (123) is housed in the input port of the valve inlet pipe (4) or the output port of the outlet pipe (5), with one side abutting against the second annular groove of the clamp assembly (12) and the other side abutting against the end face of the plug (111).

4. The pressure testing apparatus for a melt multiple valve according to claim 2, wherein The first closed threaded cap assembly (13) includes a first threaded cap (131) and a first sealing ring (132). One end of the first threaded cap (131) is provided with a first internal thread (1311), and the outer wall of the other end is provided with a first external hexagonal wrench (1312); the first sealing ring (132) is disposed inside the first threaded cap (131) and is used to abut against the end of the injection pipe (113) away from the plug (111); the first threaded cap (131) is threadedly connected to the second external thread section (1133) of the injection pipe (113) through the first internal thread (1311) to achieve sealing.

5. The pressure testing apparatus for a melt multiple valve according to claim 2, wherein The connector-type threaded cap assembly (21) includes a cap (211) and a perforated sealing gasket (212). One end of the cap (211) is provided with a second internal thread (2111) for connecting to the heat medium pipe of the valve insulation sleeve; the outer wall of the other end is provided with a second external hexagonal wrench (2112) and a third external thread section (2113) in sequence. The tube cap (211) has a through hole (2114) in the middle, and the end face of the tube cap (2113) having the third external thread section (2113) has a second sealing cone surface (2115) that communicates with the through hole (2114). The perforated sealing gasket (212) is used to be disposed between the end face of the heat medium connection pipe of the cap (211) and the valve insulation sleeve.

6. The pressure testing apparatus for a melt multiple valve according to claim 5, wherein The pressure transmission unit (3) includes a pressure transmission hose (31) and a quick-connect coupling assembly disposed at at least one end of the pressure transmission hose (31). The quick-connect coupling assembly includes a coupling body (32) and a union nut (33); the union nut (33) is sleeved on the outside of the coupling body (32), and its inner wall is provided with a third internal thread (331). One end of the connector body (32) is used to connect to the pressure transmission hose (31), and the other end is provided with a sealing part; when the quick-change connector assembly is connected to the piston plug assembly (11), the sealing part cooperates with the first sealing cone surface (1135); when connected to the connector threaded cap assembly (21), the sealing part cooperates with the second sealing cone surface (2115); The third internal thread (331) is used to thread the second external thread section (1133) of the injection pipe (113) or the third external thread section (2113) of the cap (211); by tightening the union nut (33), the sealing part is pressed against the corresponding first sealing cone surface (1135) or second sealing cone surface (2115) to form a seal.

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