Small volume and large displacement lever floating ball type steam trap

Abstract

The application discloses a small-volume large-displacement lever floating ball type steam trap, which comprises a valve body (1) and a valve cover (7). The upper end of the valve body (1) is provided with a screw plug (3). A filter screen (11) is arranged in a cavity (7-1) at the right upper end of the valve cover (7). An end cover (10) is arranged at the end (7-2) of the cavity (7-1). An outlet flow channel (7-5) is arranged in the cavity (7-1). A pressure balance emptying valve (4) is arranged in a threaded hole at the left upper part (7-4) of the valve cover. A control frame assembly (5) is arranged at the lower part of the valve cover (7). A secondary valve seat (9) is arranged in a threaded hole at the bottom of the valve cover (7). The application has the advantages of small volume, large displacement, reduced flash evaporation in the cavity, elimination of steam "steam lock" defects of the steam trap, reduced cost and reduced installation space.

Description

Technical Field

[0001] This invention relates to a small-volume, high-capacity lever-float steam trap, and more specifically to a high-pressure differential, high-capacity, stable and reliable lever-float steam trap. Background Technology

[0002] Currently, large-capacity lever float steam traps have large internal opening and closing components to meet their discharge parameters, and require an extra-large shell cavity to meet the opening and closing stroke requirements. As a result, large-capacity lever float steam traps are bulky, which increases the cost of this type of valve.

[0003] Furthermore, the excessively large internal cavity of the steam trap is a major cause of steam lock, resulting in insufficient condensate discharge from large-capacity lever float steam traps. High-temperature condensate enters the large cavity of the steam trap from the small cavity of the pipeline, causing a pressure drop and generating secondary steam that fills the cavity. This prevents condensate from entering the cavity, a problem known as steam lock in steam traps, leading to a severe shortage of condensate discharge per unit time.

[0004] Furthermore, most steam traps use bimetallic strips to regulate the discharge of non-condensable gases (air) to the atmosphere. The valve's opening and closing temperature is limited by the bimetallic properties, and the hot air inside the valve occupies the cavity space, preventing timely discharge and causing condensate buildup in the equipment pipelines, severely impacting the thermal efficiency of steam-using equipment. Summary of the Invention

[0005] The technical problems that this invention needs to solve are: a) how to meet the requirements of large discharge of condensate in a small volume; b) how to eliminate the "air blockage" problem caused by hot air.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The present invention discloses a small-volume, large-capacity lever float steam trap, which includes a valve body 1, a sealing gasket A2, a screw plug 3, a pressure-balanced vent valve 4, a control frame assembly 5, a sealing gasket B6, a valve cover 7, a sealing gasket C8, a secondary valve seat 9, a fixed end cover 10, a filter screen 11, and a sealing gasket D12.

[0008] The valve body 1 and the valve cover 7 are connected by a double-ended stud and fastened with a hexagonal head nut. A sealing gasket B6 is installed between the valve body 1 and the valve cover 7 for sealing. A screw plug 3 is provided at the upper end of the valve body 1, and a sealing gasket A2 is installed between the valve body 1 and the screw plug 3 for sealing. A filter screen 11 is installed in the cavity 7-1 located at the upper right end of the valve cover 7. A fixed end cap 10 is installed at the end 7-2 of the cavity 7-1. An outlet flow channel 7-5 is provided in the cavity 7-1. A sealing gasket D12 is installed between the end cap 10 and the end 7-2 of the cavity 7-1, and they are connected by a hexagonal head bolt 7-3.

[0009] A pressure balancing vent valve 4 is installed at the threaded hole 7-4 on the upper left side of the valve cover.

[0010] The pressure balancing vent valve 4 consists of a diaphragm box 4-1, a valve core 4-2, a limiting sleeve 4-3, and a valve seat 4-4. The diaphragm box 4-1 comprises an upper part 4-1-1 and a lower part 4-1-2. The valve seat 4-4 has a hole 4-4-1 penetrating its middle portion, with a chamfer 4-4-2 at the opening. The valve core is located at the opening of the hole 4-4-1. 4-2, simultaneously, the valve core 4-2 is placed in the limiting sleeve 4-3 and welded to the center of the inner end face of the upper part 4-1-1 of the diaphragm box. The valve seat 4-4 is inserted into the inner hole 4-1-3 located in the lower part 4-1-2 of the diaphragm box and positioned by the valve seat end face 4-4-3. Then, the valve seat end face 4-4-3 is welded to the lower part 4-1-2 of the diaphragm box. Finally, the upper part 4-1-1 of the diaphragm box and the lower part 4-1-2 of the diaphragm box are welded together as a whole.

[0011] A control frame assembly 5 is provided at the lower two positions of the valve cover 7. The control frame assembly 5 and the lower two end faces of the valve cover 7 are fitted with sealing gaskets C8. A secondary valve seat 9 is installed at the bottom threaded hole of the valve cover 7.

[0012] The lower valve seat 5-2 is provided at the lower threaded hole 5-17 of the control frame 5-1 of the control frame assembly 5, and the upper valve seat 5-9 is installed at the upper threaded hole 5-18. A valve stem 5-7 passes through the lower valve seat 5-2 and the upper valve seat 5-9. A lower bracket 5-4 and a lower valve plate 5-3 are installed in sequence at the lower end of the valve stem 5-7. The lower bracket 5-4 passes through the hole A5-2-1 of the lower valve seat 5-2 as a sealing guide for the lower valve plate 5-3. The lower bracket 5-4 and the lower valve plate 5-3 are threadedly connected to the lower end of the valve stem 5-6 by a hexagonal nut to prevent the lower bracket 5-4 and the lower valve plate 5-3 from falling off.

[0013] The upper end of valve stem 5-7 is equipped with an upper bracket 5-6 and an upper valve plate 5-5. The upper bracket 5-6 passes through the hole B5-9-1 of the upper valve seat 5-9 to serve as a guide for the upper valve plate 5-5. It is fixed to the upper end of valve stem 5-7 by a threaded connection of connecting shaft 5-10. A small screw 5-11 is installed at the slot 5-10-1 at the other end of connecting shaft 5-10. It is connected to the small screw 5-11 by a pin through holes C5-10-2 and D5-10-3 of connecting shaft 5-10. Connect the pin to hole E5-11-1. Install a cotter pin at the end of the pin to prevent it from falling off. Screw the threaded end of the small screw 5-11 into the threaded hole of the square nut 5-12 and lock it with a hexagonal nut. Insert the other end of the square nut 5-12 into the slot 5-13-1 of the rod 5-13. The pin passes through the hole E5-11-1 of the square nut 5-12 in sequence and connects with the holes F5-13-2 and G5-13-3 of the rod 5-13. Install a cotter pin at the end of the pin to prevent it from falling off.

[0014] The rod 5-13 is connected to the control frame 5-1 by passing through the holes H5-13-4 and I5-13-5 of the rod 5-13 in sequence with the holes J5-1-1 and K5-1-2 of the control frame 5-1. The end of the pin is equipped with a cotter pin to prevent it from coming off. The positioning sleeve 5-14 and the bushing 5-15 are respectively installed between the rod 5-13 and the control frame 5-1 for limiting the position. The threaded end of the rod 5-13 is equipped with a float ball 5-19. The cavity 5-1-3 of the control frame 5-1 is equipped with a water distribution plate 5-8.

[0015] This invention provides users with a small-sized lever-float type steam trap that can discharge a large volume of condensate. The design achieves a small size and large discharge capacity, reducing flash evaporation within the cavity and eliminating the steam lock-up problem inherent in steam traps. This reduces costs and installation space requirements. The pressure-balanced vent valve, installed in the upper part of the valve body cavity, can quickly expel air and non-condensable gases, solving the problem of bimetallic strips being unable to expel hot air due to temperature limitations, thus preventing air blockage in steam traps. The vent valve 4 uses a spherical seal, with the valve core 4-2 having movable clearances in the upper, lower, left, and right sides of the limiting sleeve 4-3. Therefore, when the vent valve 4 is closed, the spherical surface of the valve core 4-2 automatically aligns and seals, providing a more reliable seal than a planar diaphragm vent valve. The diaphragm 4-1 and valve seat 4-4 are welded together, resulting in a robust structure that is not easily loosened, and the vent valve 4 closes smoothly. The design of the auxiliary valve seat at the lower end of the valve cover can increase the rate at which the steam trap discharges condensate and shorten the discharge time, thereby improving the thermal efficiency of the heat exchange equipment. Attached Figure Description

[0016] Figure 1 This is a front view of a small-volume, large-displacement lever-float type steam trap according to the present invention.

[0017] Figure 2 for Figure 1 Top view

[0018] Figure 3 for Figure 1 Right view

[0019] Figure 4 for Figure 1 Front view of valve body 1

[0020] Figure 5 for Figure 4 Right view

[0021] Figure 6 for Figure 4 Left view

[0022] Figure 7 for Figure 1 Front view of valve cover 7

[0023] Figure 8 for Figure 7 Top view

[0024] Figure 9 for Figure 7 Upward rotation diagram

[0025] Figure 10 for Figure 1 Front view of middle sealing gasket A

[0026] Figure 11 for Figure 10 Top view

[0027] Figure 12 Front view of the screw plug

[0028] Figure 13 for Figure 12 Top view

[0029] Figure 14 Front view of control unit 5

[0030] Figure 15 for Figure 14 Partial sectional view

[0031] Figure 16 Front view of the control frame

[0032] Figure 17 for Figure 14 Top view

[0033] Figure 18 for Figure 14 Right view

[0034] Figure 19 Front view of the lower valve seat Figure 20 for Figure 19 Top view Figure 21 Front view of the lower valve plate Figure 22 Front view of the lower support Figure 23 for Figure 22 Top view Figure 24 Front view of the upper valve plate Figure 25 Front view of the upper support Figure 26 for Figure 25 Top view Figure 27 Front view of the valve stem Figure 28 Front view of the splitter plate Figure 29 Front view of the upper valve seat Figure 30 for Figure 29 Top view Figure 31 Front view of the connecting axis Figure 32 for Figure 31 Top view Figure 33 Front view of the small screw Figure 34Front view of a square nut Figure 35 for Figure 34 Top view

[0035] Figure 36 Front view of the pole frame

[0036] Figure 37 for Figure 36 Top view

[0037] Figure 38 The main view for positioning sleeve A

[0038] Figure 39 The main view for positioning kit B

[0039] Figure 40 Front view of the float

[0040] Figure 41 Front view of the vent valve

[0041] Figure 42 for Figure 41 Front view of the middle valve seat

[0042] Figure 43 for Figure 41 Front view of the middle membrane box

[0043] Figure 44 for Figure 1 Main view of the intermediate and auxiliary valve seats

[0044] Figure 45 for Figure 44 Top view

[0045] Figure 46 Schematic diagram of the medium

[0046] Figure 47 A diagram showing the state of air (non-condensable gas) and low-temperature condensate passing through a steam trap.

[0047] Figure 48 A state diagram showing a small amount of high-temperature condensate and flash vapor passing through a steam trap.

[0048] Figure 49 A diagram showing the state of a large amount of high-temperature condensate passing through a steam trap.

[0049] Figure 50 Diagram showing the state of steam entering the steam trap.

[0050] In the diagram: Valve body 1, Sealing gasket A2, Plug 3, Pressure balance vent valve 4, Diaphragm box 4-1, Upper diaphragm box 4-1-1, Lower diaphragm box 4-1-2, Inner hole 4-1-3, Valve core 4-2, Limit sleeve 4-3, Valve seat 4-4, Hole 4-4-1, Chamfer at the opening 4-4-2, Valve seat end face 4-4-3, Control frame assembly 5, Control frame 5-1, Hole A 5-1-1, Hole 5-1-2, Cavity 5-1-3, Lower valve seat 5-2, Lower valve plate 5-3, Lower bracket 5-4, Upper valve plate 5-5, Upper bracket 5-6, Valve stem 5-7, Divider plate 5-8, Upper valve seat 5-9, Hole B 5-9-1, Connecting shaft 5-10, Slot 5-10-1, Hole C 5- 10-2, Hole D5-10-3, Small Screw 5-11, Hole E5-11-1, Square Nut 5-12, Rod 5-13, Slot Hole 5-13-1, Hole F5-13-2, Hole G5-13-3, Hole H5-13-4, Hole I5-13-5, Positioning Sleeve 5-14, Bushing 5-15, Lower Threaded Hole 5-17, Upper Threaded Hole 5-18, Float 5-19, Sealing Gasket B6, Valve Cover 7, Cavity 7-1, End 7-2, Hex Head Bolt 7-3, Upper Left Side of Valve Cover 7-4, Outlet Flow Channel 7-5, Flow Channel I 7-6, Flow Channel II 7-7, Sealing Gasket C8, Secondary Valve Seat 9, Fixed End Cap 10, Filter Screen 11, Sealing Gasket D12. Detailed Implementation

[0051] The following will be combined with the appendix Figure 1-45 The present invention will be further described below.

[0052] exist Figures 1-45 In the middle section: Valve body 1 and valve cover 7 are connected by double-ended studs and secured with hexagonal head nuts. A seal B6 is installed between valve body 1 and valve cover 7 for sealing. A screw plug 3 is provided at the upper end of valve body 1, and a sealing gasket A2 is installed between valve body 1 and screw plug 3 for sealing. A filter screen 11 is installed in cavity 7-1 located at the upper right end of valve cover 7. An end cap 10 is installed at the end 7-2 of cavity 7-1, and a sealing gasket D12 is installed between end cap 10 and the end 7-2 of cavity 7-1, connected by hexagonal head bolts 7-3. A pressure balancing vent valve 4 is installed at the threaded hole at the upper left side 7-4 of valve cover. Figures 41-43As shown, the pressure balancing vent valve 4 consists of a diaphragm box 4-1, a valve core 4-2, a limiting sleeve 4-3, and a valve seat 4-4. The diaphragm box 4-1 is composed of an upper diaphragm box 4-1-1 and a lower diaphragm box 4-1-2. The valve seat 4-4 has a hole 4-4-1 penetrating its middle portion, and the opening of the hole 4-4-1 has a chamfer 4-4-2 for shaping and sealing. A valve core 4-2 is installed at the end, and the valve core 4-2 is placed in the limiting sleeve 4-3 and welded to the center of the inner end face of the upper part 4-1-1 of the diaphragm box; the valve seat 4-4 is inserted into the inner hole 4-1-3 located in the lower part 4-1-2 of the diaphragm box, and is positioned by the valve seat end face 4-4-3, and then the valve seat end face 4-4-3 is welded to the lower part 4-1-2 of the diaphragm box; finally, the upper part 4-1-1 of the diaphragm box and the lower part 4-1-2 of the diaphragm box are welded together. The function of the pressure balancing vent valve 4 is to quickly discharge hot air and flash steam to prevent "air lock" and "steam lock" problems. Since the cavity of the valve body 1 is larger than the inner diameter of the valve body 1 pipe, when hot condensate enters the cavity of the valve body 1 through the pipe, the pressure is reduced and flash steam is formed. Hot air is less dense than flash steam, so after entering the valve body 1 cavity, hot air accumulates at the top of the cavity, while flash steam accumulates in the upper half. Therefore, the pressure-balanced vent valve 4 is installed on the upper part of the valve cover 7, approximately 2 / 3 of the total volume of the valve and valve cover 7, allowing for rapid discharge of hot air and flash steam. Furthermore, the installation of the pressure-balanced vent valve 4 at this location allows hot air and flash steam to be discharged into the outlet channel 7-5 of the valve cover 7, eliminating the safety hazard of external discharge of hot air and flash steam. This plays a crucial role in high-pressure steam traps. The pressure-balanced vent valve 4 is not temperature-limited and can discharge media with temperatures lower than a certain pressure but with varying degrees of subcooling (subcooling refers to the difference between the temperature of the discharged medium and the saturation temperature at a certain steam pressure). Therefore, the discharge temperature of the pressure-balanced vent valve 4 can be determined based on actual operating conditions, preventing problems caused by excessively high temperatures that could prevent the discharge of hot air and flash steam. (For example, a bimetallic strip vent valve may deform and close the vent valve seat due to excessive temperature, causing "air blockage" and "vapor lock" problems, which prevent the hot condensate from entering the cavity and cause the steam trap to malfunction.)

[0053] A control frame assembly 5 is installed at the lower two positions of the valve cover 7. The control frame assembly 5 and the lower two end faces of the valve cover 7 are fitted with sealing gaskets C8. A secondary valve seat 9 is installed at the bottom threaded hole of the valve cover 7. Its function is to quickly discharge the condensate in the pipeline when the amount of condensate is large, thus solving the problem that the small control frame cannot meet the requirement of large condensate discharge (the valve seat orifice of the small control frame is small and cannot discharge a large amount of condensate per unit time).

[0054] The lower valve seat 5-2 is provided at the threaded hole 5-17 at the lower end of the control frame 5-1 of the control frame assembly 5, and the upper valve seat 5-9 is installed at the threaded hole 5-18 at the upper end. A valve stem 5-7 passes through the lower valve seat 5-2 and the upper valve seat 5-9. A lower bracket 5-4 and a lower valve plate 5-3 are installed sequentially at the lower end of the valve stem 5-7. The lower bracket 5-4 passes through the hole A5-2-1 of the lower valve seat 5-2 as a sealing guide for the lower valve plate 5-3. The lower bracket 5-4 and the lower valve plate 5-3 are threadedly connected to the lower end of the valve stem 5-6 by a hexagonal nut to prevent the lower bracket 5-4 and the lower valve plate 5-3 from falling off.

[0055] The upper end of valve stem 5-7 is equipped with an upper bracket 5-6 and an upper valve plate 5-5. The upper bracket 5-6 passes through the hole B5-9-1 of the upper valve seat 5-9 to serve as a guide for the upper valve plate 5-5. It is fixed to the upper end of valve stem 5-7 by a threaded connection of connecting shaft 5-10. A small screw 5-11 is installed at the slot 5-10-1 at the other end of connecting shaft 5-10. It is connected to the hole E5-11-1 of small screw 5-11 by a pin. The pin end is equipped with a cotter pin to prevent it from falling off. The threaded end of small screw 5-11 is screwed into the threaded hole of square nut 5-12 and locked with a hexagonal nut. The other end of the square nut 5-12 is inserted into the slot 5-13-1 of the rod 5-13. The pin is then inserted into the hole E5-11-1 of the square nut 5-12 and connected to the holes F5-13-2 and G5-13-3 of the rod 5-13. A cotter pin is installed at the end of the pin to prevent it from falling off.

[0056] The lever 5-13 is slidably connected to the control frame 5-1 through holes H5-13-4 and I5-13-5 in sequence, and holes J5-1-1 and K5-1-2 in sequence, via pins. A cotter pin is fitted to the end of the pin to prevent disengagement. Positioning sleeves 5-14 and 5-15 are respectively installed between the lever 5-13 and the control frame 5-1 for limiting movement. A float ball 5-19 is installed at the threaded end of the lever 5-13. A water distribution plate 5-8 is installed inside the cavity 5-1-3 of the control frame 5-1.

[0057] exist Figures 44-48In the initial stage of operation, the steam-using equipment and conveying pipelines are in a cold state, which will generate a large amount of low-temperature condensate, non-condensable gas (air), and a large amount of low-temperature condensate into valve body 1. The non-condensable gas (air) is discharged through pressure balance vent valve 4 through flow channel I 7-6 to outlet flow channel 7-5 (solving the "air blockage" problem). 40% of the low-temperature condensate is discharged through auxiliary valve seat 9 through flow channel II 7-7 to outlet flow channel 7-5. The remaining 60% of the low-temperature condensate accumulates in the cavity inside valve body 1. Buoyancy can lift the float 5-19, causing the rod frame 5-13 to rotate around the long pin shaft. This causes the square nut 5-12, small screw 5-11, connecting shaft 5-10, and valve stem 5-7 to move the upper bracket 5-6, upper valve plate 5-5, lower bracket 5-4, and lower valve plate 5-3 towards the lower part of the inner cavity of the valve body 1. This causes the upper valve plate 5-5 and lower valve plate 5-3 to disengage from the seal with the upper valve seat 5-9 and lower valve seat 5-2, thereby opening the valve and discharging 60% of the low-temperature condensate into the outlet channel 7-5.

[0058] After the low-temperature condensate is discharged, the high-temperature condensate enters the cavity of valve body 1. Due to the small amount of initial process materials input (or batch input of materials), the amount of high-temperature condensate output is relatively small. Therefore, when the high-temperature condensate enters the cavity of valve body 1, due to the small amount of high-temperature condensate, it can be discharged through the auxiliary valve seat 9 and flow channel II 7-7 to the outlet flow channel 7-5. At this time, the float 5-19 loses buoyancy and rotates and falls with the long pin shaft as the fulcrum. This drives the square nut 5-12, the small screw 5-11, the connecting shaft 5-10, and the valve stem 5-7 to move the upper bracket 5-6, the upper valve plate 5-5, the lower bracket 5-4, and the lower valve plate 5-3 upward into the inner cavity of valve body 1, so that the upper valve plate 5-5 and the lower valve plate 5-3 seal with the upper valve seat 5-9 and the lower valve seat 5-2 again. Since the temperature inside the valve is lower than the closing temperature of the pressure balance vent valve 4, the flash steam is discharged through the pressure balance vent valve 5 and through the flow channel 7-6 to the outlet flow channel 7-5, thus solving the steam "steam lock" problem.

[0059] When the input of process materials increases to the point of operating at full load, a large amount of high-temperature condensate enters the cavity of valve body 1. Flash steam is still discharged through pressure balance vent valve 4 through flow channel I 7-6 to outlet flow channel 7-5. 40% of the high-temperature condensate is discharged through auxiliary valve seat 9 through flow channel II 7-7 to outlet flow channel 7-5. The remaining 60% of the high-temperature condensate accumulates in the cavity of valve body 1, generating buoyancy that lifts float ball 5-16. This causes rod frame 5-13 to rotate around long pin shaft as fulcrum. Consequently, square nut 5-12, small screw 5-11, connecting shaft 5-10, and valve stem 5-7 drive upper bracket 5-6, upper valve plate 5-5, lower bracket 5-4, and lower valve plate 5-3 to move towards the lower part of the inner cavity of valve body 1. This causes upper valve plate 5-5 and lower valve plate 5-3 to disengage from the seal between upper valve seat 5-9 and lower valve seat 5-2, thereby opening the valve and discharging 60% of the high-temperature condensate to outlet flow channel 7-5. At this time, if the temperature inside the valve is higher than that of the pressure balance vent valve 4, the valve will be closed; if it is lower than the closing temperature of the pressure balance vent valve 4, the valve will be open and will still be in the state of discharging flash steam (that is, the opening and closing of the pressure balance vent valve 4 can be set according to the discharge temperature of the site conditions, and different subcooling pressure balance vent valves 4 can be set to solve the steam "steam lock" problem).

[0060] After the high-temperature condensate is drained, steam enters the steam trap. The float 5-19 loses buoyancy and gradually falls, rotating around the long pin as a fulcrum. This rotation drives the square nut 5-12, small screw 5-11, connecting shaft 5-10, and valve stem 5-7, causing the upper bracket 5-6, upper valve plate 5-5, lower bracket 5-4, and lower valve plate 5-3 to move upwards into the inner cavity of valve body 1, resealing the upper valve plate 5-5 and lower valve plate 5-3 with the upper valve seat 5-9 and lower valve seat 5-2. The condensate generated by steam cooling flows through the auxiliary valve seat 9 and through flow channel II 7-7 to the outlet flow channel 7-5. Because continuous steam cooling produces condensate, the auxiliary valve seat 9 is always below the condensate (i.e., creating a water seal). Therefore, when the control frame assembly 5 is closed, no steam leakage occurs. This operating mode circulates according to the process water flow.

[0061] In summary, the pressure-balanced vent valve 4 of this invention can maximize the discharge of air (non-condensable gases) and flash steam. It solves the problem of insufficient condensate discharge in large-capacity lever float-type steam traps caused by air "blockage" and steam "lock". The pressure-balanced vent valve 4, installed at approximately 2 / 3 of the cavity, allows the discharged steam / gas to pass through the flow channel to the outlet flow channel 7-5, ensuring safe and reliable discharge. The design of installing the auxiliary valve seat 9 at the lower part of the valve cover 7 achieves the requirement of large discharge in a small volume. The auxiliary valve seat 9 can be designed to discharge according to the minimum process flow rate. As the condensate volume increases, the auxiliary valve seat 9 continuously discharges while the control frame assembly 5 starts draining to meet the ultra-large discharge requirements. When the condensate volume decreases, the control frame assembly 5 closes, and the auxiliary valve seat 9 continuously discharges. Because the auxiliary valve seat 9 is designed to be installed at the lower part of the valve cover 7 (i.e., the bottom of the valve body 1's inner cavity), steam leakage is impossible even with a condensate water seal.

Claims

1. A small-volume, large-capacity lever-float type steam trap, characterized in that: The steam trap includes a valve body (1), a sealing gasket A (2), a screw plug (3), a pressure-balanced drain valve (4), a control frame assembly (5), a sealing gasket B (6), a valve cover (7), a sealing gasket C (8), a secondary valve seat (9), a fixed end cap (10), a filter screen (11), and a sealing gasket D (12). A. The valve body (1) and the valve cover (7) are connected by a double-ended stud and fastened with a hexagonal head nut. A sealing gasket B (6) is installed between the valve body (1) and the valve cover (7) for sealing. A screw plug (3) is provided at the upper end of the valve body (1). A sealing gasket A (2) is installed between the valve body (1) and the screw plug (3) for sealing. A filter screen (11) is installed in the cavity (7-1) located at the upper right end of the valve cover (7). An end cap (10) is installed at the end (7-2) of the cavity (7-1). An outlet flow channel (7-5) is provided in the cavity (7-1). A sealing gasket D (12) is installed between the end cap (10) and the end (7-2) of the cavity (7-1). They are connected by a hexagonal head bolt (7-3). B. A pressure-balanced vent valve (4) is installed at the threaded hole on the upper left side (7-4) of the valve cover. The pressure-balanced vent valve (4) consists of a diaphragm (4-1), a valve core (4-2), a limiting sleeve (4-3), and a valve seat (4-4). The diaphragm (4-1) consists of an upper part (4-1-1) and a lower part (4-1-2). The valve seat (4-4) has a hole (4-4-1) in the middle that penetrates the middle part of the valve seat (4-4). The opening end of the hole (4-4-1) has a chamfer (4-4-2). A valve core (4-2) is provided at the opening end of the hole (4-4-1). The valve core (4-2) is placed in the limiting sleeve (4-3) and welded to the center of the inner end face of the upper part (4-1-1) of the diaphragm box. The valve seat (4-4) is inserted into the inner hole (4-1-3) of the lower part (4-1-2) of the diaphragm box and positioned by the valve seat end face (4-4-3). The valve seat end face (4-4-3) is welded to the lower part (4-1-2) of the diaphragm box. The upper part (4-1-1) of the diaphragm box and the lower part (4-1-2) of the diaphragm box are welded together as a whole. C. A control frame assembly (5) is provided at the lower two positions of the valve cover (7), and a sealing gasket C (8) is installed on the end face of the control frame assembly (5) and the lower two positions of the valve cover (7); a secondary valve seat (9) is installed at the bottom threaded hole of the valve cover (7).

2. The small-volume, large-capacity lever-float type steam trap as described in claim 1, characterized in that: The control frame assembly (5) has a lower valve seat (5-2) at the lower end threaded hole (5-17) and an upper valve seat (5-9) at the upper end threaded hole (5-18). A valve stem (5-7) passes between the lower valve seat (5-2) and the upper valve seat (5-9). A lower bracket (5-4) and a lower valve plate (5-3) are installed at the lower end of the valve stem (5-7). The lower bracket (5-4) passes into the hole A (5-2-1) of the lower valve seat (5-2) as a sealing guide for the lower valve plate (5-3). The lower bracket (5-4) is threaded to the lower end of the valve stem (5-7) through a hexagonal nut to prevent the lower bracket (5-4) and the lower valve plate (5-3) from falling off. The upper end of the valve stem (5-7) is equipped with an upper bracket (5-6) and an upper valve plate (5-5). The upper bracket (5-6) passes through the hole B (5-9-1) of the upper valve seat (5-9) to serve as a guide for the upper valve plate (5-5). It is fixed to the upper end of the valve stem (5-7) by a threaded connection between the connecting shaft (5-10) and the upper end of the valve stem (5-7). A small screw (5-11) is installed in the slot (5-10-1) at the other end of the connecting shaft (5-10). It is connected by a pin and passes through the holes C (5-10-2) and D (5-10-3) of the connecting shaft (5-10) in sequence to the small screw (5-11). Connect the pin to hole E (5-11-1) of the rod (5-11). Install a cotter pin at the end of the pin to prevent it from falling off. Screw the threaded end of the small screw (5-11) into the threaded hole of the square nut (5-12) and lock it with a hexagonal nut. Insert the other end of the square nut (5-12) into the slot (5-13-1) of the rod (5-13). The pin passes through the hole E (5-11-1) of the square nut (5-12) and connects it to the holes F (5-13-2) and G (5-13-3) of the rod (5-13). Install a cotter pin at the end of the pin to prevent it from falling off. The rod (5-13) is connected to the control frame (5-1) by passing through the holes H (5-13-4) and I (5-13-5) of the rod (5-13) in sequence with the holes J (5-1-1) and K (5-1-2) of the control frame (5-1) in sequence. The end of the pin is equipped with a cotter pin to prevent it from falling off. The rod (5-13) and the control frame (5-1) are respectively equipped with a positioning sleeve (5-14) and a bushing (5-15) for limiting the position. The threaded end of the rod (5-13) is equipped with a float ball (5-19). The cavity (5-1-3) of the control frame (5-1) is equipped with a water distribution plate (5-8).

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