Pilot-operated type single exhalation valve

Abstract

The utility model discloses a pilot-operated type single exhalation valve which comprises a main valve body and a pilot-operated valve, the bottom of the main valve body is provided with a feeding port, one side of the main valve body is provided with a discharging port, a piston is connected inside the main valve body in an up-down sliding mode, and the pilot-operated valve is provided with an inlet pipe and a discharge pipe. The inlet pipe and the side wall of a feeding port of the main valve body are jointly connected with a first communicating pipe, the top end of the main valve body is open, and a top plate is fixed to the top end of the main valve body. According to the utility model, the main valve body, the pilot valve, the piston, the first communicating pipe, the second communicating pipe, the top plate, the top cover and the fixing assembly are arranged, when a sealing ring on the surface of the piston needs to be replaced, the second communicating pipe and an external threaded pipe on the top cover are quickly disassembled, and then the top cover can be quickly disassembled by releasing the fixing of the fixing assembly on the top cover; therefore, the piston can be conveniently taken out from the top of the main valve body, a sealing ring on the surface of the piston can be conveniently and rapidly replaced, and later maintenance convenience of the valve is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially, relates to a pilot single call valve. BACKGROUND

[0002] The pilot single call valve is a kind of high-efficiency valve device for controlling the one-way flow of gas or liquid, mainly used in industrial pipeline system, storage tank and pressure vessel scenes, to ensure that medium only flows in the set direction, prevent equipment damage caused by reverse flow or pressure anomaly.The core working principle is to drive the main valve to open and close quickly by the auxiliary control of pilot valve using system pressure difference, which has the advantages of fast response, good sealing performance, high pressure resistance and long service life compared with traditional single call valve.The valve is usually composed of valve body, valve clapper, spring, pilot control mechanism and other components, compact structure and easy to maintain, suitable for high pressure or corrosive medium environment in petroleum, chemical industry, natural gas, power and other industries.

[0003] The current pilot single call valve is provided with a sealing ring on the surface of the piston inside, and because the pilot valve needs to keep the pipeline and equipment pressure balanced, the frequency of the piston moving up and down is high, which will cause the sealing ring on the surface of the piston to wear out quickly, but the existing pilot single call valve is not convenient to quickly take out the piston from the inside of the valve body for replacement of the sealing ring, and the maintenance efficiency is low in later period, so further improvement is needed. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the shortcomings in prior art and provides a pilot single call valve.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a pilot single call valve, including main valve body and pilot valve, the bottom of main valve body is feed inlet, and the side of main valve body is equipped with discharge port, the piston is slidably connected inside main valve body, the pilot valve is equipped with inlet pipe and discharge pipe, the inlet pipe and the sidewall of feed inlet of main valve body are connected with first communicating pipe, the top end of main valve body is designed as open, and the top end of main valve body is fixed with top plate, the top surface of top plate is attached with top cover, and the middle part of top cover is fixed with external thread pipe, the external thread pipe and discharge pipe are connected with second communicating pipe, the side of top plate is provided with two symmetrical movable grooves, and the movable groove is connected with fixed assembly for fixing top cover.

[0006] Further, the piston surface is clamped with a sealing ring.

[0007] Further, the sidewall of the bottom end of the main valve body and the feed inlet are provided with a side opening, one end of the first communicating pipe is fixedly connected with the side opening, and the other end of the first communicating pipe is rotatably connected with the inlet pipe through a sealing bearing.

[0008] Furthermore, the top end of the second connecting pipe is fixedly connected to the discharge pipe, and the bottom end of the second connecting pipe is fixed with an end plate, which is located above the external threaded pipe. An internal threaded sleeve is slidably sleeved on the bottom end of the second connecting pipe and the surface of the end plate. The internal threaded sleeve is connected to the surface of the external threaded pipe through thread rotation. The second connecting pipe is connected to the external threaded pipe.

[0009] Furthermore, a sealing strip is fixed to the lower surface of the end plate.

[0010] Furthermore, the fixing component includes a tension spring fixed to the inner wall of the movable groove, a sliding plate fixed to the other end of the tension spring, and the sliding plate is slidably connected to the movable groove. A bent rod is fixed to the other side of the sliding plate, and the other end of the bent rod is bent upward and fixed to a connecting plate. The connecting plate is located above the top cover, and a bolt is rotatably connected to the middle of the connecting plate by a thread. A threaded groove for screwing in the bolt is opened on the upper surface of the top cover.

[0011] Furthermore, a sealing ring is fixed to the upper surface of the top plate.

[0012] The beneficial effects of this utility model are:

[0013] In use, this utility model is a pilot-operated single-call valve, which includes a main valve body, a pilot valve, a piston, a first connecting pipe, a second connecting pipe, a top plate, a top cover, and a fixing assembly. When it is necessary to replace the sealing ring on the piston surface, the second connecting pipe is first quickly separated from the external threaded pipe on the top cover, and then the top cover is quickly removed by releasing the fixing assembly. This allows the top cover to be quickly disassembled, making it easy to remove the piston from the top of the main valve body. This facilitates the quick replacement of the sealing ring on the piston surface and improves the convenience of subsequent maintenance of the valve. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 Overall sectional view of this utility model;

[0016] Figure 2 Partial perspective view of this utility model;

[0017] Figure 3 The present utility model Figure 1 Enlarged view of point A in the middle;

[0018] Figure 4 The present utility model Figure 1 Enlarged view of section B in the middle.

[0019] Reference signs are as follows:

[0020] 1, main valve body; 101, feed port; 102, discharge port; 103, side port; 2, pilot valve; 21, inlet pipe; 22, discharge pipe; 3, piston; 4, first communication pipe; 5, second communication pipe; 51, end plate; 52, internally threaded sleeve; 6, top plate; 61, movable groove; 7, top cover; 71, externally threaded pipe; 8, fixed assembly; 81, tension spring; 82, sliding plate; 83, bent rod; 84, connecting plate; 85, bolt. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] As shown in Figures 1-4 the drawings, it relates to a pilot-operated single call valve, which comprises a main valve body 1 and a pilot valve 2. The bottom of the main valve body 1 is a feed port 101, and one side of the main valve body 1 is provided with a discharge port 102. The piston 3 is slidably connected inside the main valve body 1. The pilot valve 2 is provided with an inlet pipe 21 and a discharge pipe 22. The inlet pipe 21 and the sidewall of the feed port 101 of the main valve body 1 are jointly connected with a first communication pipe 4. The top end of the main valve body 1 is designed as an open port, and the top end of the main valve body 1 is fixedly provided with a top plate 6. The top plate 6 is provided with a top cover 7 on the upper surface. The middle part of the top cover 7 is fixedly provided with an externally threaded pipe 71. The externally threaded pipe 71 and the discharge pipe 22 are jointly connected with a second communication pipe 5. Two symmetrical movable grooves 61 are formed in the side edge of the top plate 6, and the movable grooves 61 are connected with a fixed assembly 8 for fixing the top cover 7.

[0023] In this embodiment, the structure of the pilot valve 2 is completely the same as that of the prior art.

[0024] The surface of the piston 3 is clamped with a sealing ring.

[0025] In this embodiment, the surface of the piston 3 is provided with a plurality of annular grooves for clamping the sealing ring. The sealing ring can be directly disassembled from the annular groove, and the sealing ring is convenient to replace.

[0026] The sidewall of the bottom end of the main valve body 1 and the feed port 101 are provided with a side port 103. One end of the first communication pipe 4 is fixedly connected with the side port 103, and the other end of the first communication pipe 4 is rotatably connected with the inlet pipe 21 through a sealing bearing.

[0027] Since the top end of the first communication pipe 4 is rotationally connected with the inlet pipe 21, the second communication pipe 5 can be rotated to the side away from the main valve body 1 by rotating the pilot valve 2, so as to facilitate the disassembly of the top cover 7.

[0028] The top end of the second communication pipe 5 is fixedly connected with the discharge pipe 22, and the bottom end of the second communication pipe 5 is fixedly connected with an end plate 51, and the end plate 51 is located above the outer threaded pipe 71. The bottom end of the second communication pipe 5 and the surface of the end plate 51 are slidingly sleeved with an inner threaded sleeve 52, and the inner threaded sleeve 52 is rotationally connected to the surface of the outer threaded pipe 71 through threads. The second communication pipe 5 is in communication with the outer threaded pipe 71.

[0029] When connecting the second communication pipe 5 with the outer threaded pipe 71, the pilot valve 2 is horizontally rotated at the top of the first communication pipe 4, so that the end plate 51 is attached to the upper surface of the outer threaded pipe 71, and then the inner threaded sleeve 52 is screwed down to the surface of the outer threaded pipe 71. When disassembling, the inner threaded sleeve 52 is rotated upward and separated from the outer threaded pipe 71, and at this time, the second communication pipe 5 can be separated from the outer threaded pipe 71 by rotating the pilot valve 2.

[0030] The lower surface of the end plate 51 is fixedly connected with a sealing strip. By arranging the sealing strip, the sealing property between the end plate 51 and the outer threaded pipe 71 can be increased.

[0031] The fixing assembly 8 comprises a tension spring 81 fixed to the inner side wall of the movable groove 61, the other end of the tension spring 81 is fixedly connected with a sliding plate 82, and the sliding plate 82 is slidingly connected with the movable groove 61. The other side of the sliding plate 82 is fixedly connected with a bent rod 83, the other end of the bent rod 83 is upwardly bent and fixedly connected with a connecting plate 84, the connecting plate 84 is located above the top cover 7, and a bolt 85 is penetratingly and rotationally connected with the connecting plate 84 through threads in the middle part of the connecting plate 84. The upper surface of the top cover 7 is provided with a threaded groove for screwing in the bolt 85.

[0032] In this embodiment, when installing the top cover 7, the connecting plate 84 is first moved away from the top plate 6 by pulling the bent rod 83, and then the top cover 7 is placed on the surface of the top plate 6. After the bent rod 83 is loosened, the sliding plate 82 is reset by the tension spring 81, so as to drive the bottom part of the bent rod 83 to move into the movable groove 61. At this time, the connecting plate 84 moves above the top cover 7, and finally the bolt 85 is screwed into the threaded groove on the surface of the top cover 7. When disassembling the top cover 7, the bolt 85 is first unscrewed, and then the connecting plate 84 is separated from the top cover 7 by pulling the bent rod 83, so that the top cover 7 can be disassembled from the surface of the top plate 6.

[0033] The upper surface of the top plate 6 is fixedly connected with a sealing ring. The sealing ring can increase the sealing property between the top plate 6 and the top cover 7.

[0034] Working principle: the valve is used, the working principle is same with the existing pilot type single call valve. When the sealing ring of the piston 3 surface needs to be replaced, the inner thread sleeve 52 is unscrewed from the surface of the outer thread pipe 71, then the pilot valve 2 is rotated to make the second communication pipe 5 separate from the outer thread pipe 71, then the bolt 85 is unscrewed and separated from the threaded groove on the top cover 7, then the connecting plate 84 is separated from the top cover 7 by pulling the bent rod 83, then the top cover 7 is disassembled, finally the piston 3 is taken out from the inside of the main valve body 1 to replace the sealing ring on the surface of the piston 3. After the replacement is completed, reverse assembly can be carried out.

[0035] The preferred embodiments disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details and limit the utility model to the specific implementation. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the whole scope and equivalents.

Claims

1. A pilot-operated single-call valve, comprising a main valve body (1) and a pilot valve (2), characterized in that: The bottom of the main valve body (1) is a feed inlet (101), and the side of the main valve body (1) is provided with a discharge outlet (102). The piston (3) is slidably connected inside the main valve body (1). The pilot valve (2) is provided with an inlet pipe (21) and a discharge pipe (22). The inlet pipe (21) and the side wall of the feed inlet (101) of the main valve body (1) are connected together by a first connecting pipe (4). The top of the main valve body (1) is an open design, and a top plate (6) is fixed to the top of the main valve body (1). A top cover (7) is attached to the upper surface of the top plate (6), and an external threaded pipe (71) is fixed in the middle of the top cover (7). The external threaded pipe (71) and the discharge pipe (22) are connected together by a second connecting pipe (5). Two symmetrical movable grooves (61) are opened on the side of the top plate (6). A fixing component (8) for fixing the top cover (7) is connected inside the movable groove (61).

2. The pilot-operated single-call valve according to claim 1, characterized in that: A sealing ring is attached to the surface of the piston (3).

3. A pilot-operated single-call valve according to claim 1, characterized in that: The main valve body (1) has a side port (103) on the bottom side wall that is connected to the feed port (101). One end of the first connecting pipe (4) is fixedly connected to the side port (103), and the other end of the first connecting pipe (4) is rotatably connected to the inlet pipe (21) through a sealed bearing.

4. A pilot-operated single-call valve according to claim 1, characterized in that: The top end of the second connecting pipe (5) is fixedly connected to the discharge pipe (22). The bottom end of the second connecting pipe (5) is fixed with an end plate (51), and the end plate (51) is located above the external threaded pipe (71). The bottom end of the second connecting pipe (5) and the surface of the end plate (51) are slidably fitted with an internal threaded sleeve (52). The internal threaded sleeve (52) is connected to the surface of the external threaded pipe (71) by thread rotation. The second connecting pipe (5) is connected to the external threaded pipe (71).

5. A pilot-operated single-call valve according to claim 4, characterized in that: A sealing strip is fixed to the lower surface of the end plate (51).

6. A pilot-operated single-call valve according to claim 1, characterized in that: The fixing component (8) includes a tension spring (81) fixed to the inner wall of the movable groove (61). The other end of the tension spring (81) is fixed to a sliding plate (82), and the sliding plate (82) is slidably connected to the movable groove (61). The other side of the sliding plate (82) is fixed to a bent rod (83). The other end of the bent rod (83) is bent upward and fixed to a connecting plate (84). The connecting plate (84) is located above the top cover (7). The middle of the connecting plate (84) is through which a bolt (85) is rotatably connected. The upper surface of the top cover (7) is provided with a threaded groove for screwing in the bolt (85).

7. A pilot-operated single-call valve according to claim 1, characterized in that: A sealing ring is fixed on the upper surface of the top plate (6).

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