CN213117618U

CN213117618U - Pressure regulating valve device with nitrogen seal

Info

Publication number: CN213117618U
Application number: CN202021957918.2U
Authority: CN
Inventors: 唐晓武
Original assignee: Roland Automatic Control Valve Shanghai Co ltd
Current assignee: Roland Automatic Control Valve Shanghai Co ltd
Priority date: 2020-09-09
Filing date: 2020-09-09
Publication date: 2021-05-04
Anticipated expiration: 2030-09-09

Abstract

The utility model discloses a pressure regulating valve device with nitrogen seal, which comprises a first pressure reducing valve component, a connecting flange structure communicated with the first pressure reducing valve component and a second pressure relief valve communicated with the connecting flange structure, wherein the connecting flange structure comprises a connecting pipe and a connecting flange communicated with the connecting pipe, one end of the connecting pipe is communicated with the first pressure reducing valve component, and the other end is communicated with the second pressure relief valve; the second pressure release valve comprises a second upper valve cover, a second valve core sleeved in the second upper valve cover and a second membrane head assembly fixed on the second valve core; the first pressure reducing valve component comprises a first upper valve cover, a first valve core sleeved in the first upper valve cover and a first membrane head component fixed on the first valve core. According to the utility model discloses, simple structure is practical, can follow the direct pressure regulating of 0.8Mpa to 2Kpa, but also the protection of nitrogen gas, can the superpressure safety discharge again.

Description

Pressure regulating valve device with nitrogen seal

Technical Field

The utility model relates to a pressure relief device's technical field, in particular to pressure regulating valve device with nitrogen seals.

Background

The pressure relief valve is composed of needle valve, pressure gauge, main valve, pilot valve and connecting tube. The main valve is divided into upper and lower parts by a diaphragm, the lower cavity of the diaphragm is a water flow channel, and the upper cavity is a control chamber for controlling the opening and closing of the valve clack of the main valve. The pressure reducing valve is a valve which reduces the inlet pressure to a certain required outlet pressure through regulation and leads the outlet pressure to be automatically kept stable by relying on the energy of the medium. From the viewpoint of hydrodynamics, the pressure reducing valve is a throttling element with variable local resistance, namely, the flow speed and the kinetic energy of fluid are changed by changing the throttling area to cause different pressure losses, thereby achieving the purpose of pressure reduction.

In the prior art, a nitrogen sealing device of a storage tank consists of a quick release valve and a micro-pressure regulating valve, wherein the quick release valve consists of a pressure controller and a single-seat cut-off valve. The nitrogen sealing device has the advantages of complex structure, large volume and high cost.

SUMMERY OF THE UTILITY MODEL

To the weak point that exists among the prior art, the utility model aims at providing a regulated pressure valve device with nitrogen seal, simple structure is practical, can follow the direct pressure regulating of 0.8Mpa to 2Kpa, and the protection of nitrogen gas in addition can the superpressure discharge safely again. In order to achieve the above objects and other advantages in accordance with the present invention, there is provided a regulated pressure valve assembly having a nitrogen seal, comprising:

the connecting flange structure comprises a connecting pipe and a connecting flange communicated with the connecting pipe, one end of the connecting pipe is communicated with the first pressure reducing valve assembly, and the other end of the connecting pipe is communicated with the second pressure reducing valve;

the second pressure release valve comprises a second upper valve cover, a second valve core sleeved in the second upper valve cover and a second membrane head assembly fixed on the second valve core, a cavity with a through hole is arranged in the second upper valve cover, one end of the second valve core penetrates through the cavity in the second upper valve cover and extends into the second membrane head assembly, a through groove is formed in the center of the second valve core, and a second through groove is formed in one side surface of the second valve core positioned at the end of the bottom;

the first pressure reducing valve assembly comprises a first upper valve cover, a first valve core sleeved in the first upper valve cover and a first membrane head assembly fixed on the first valve core, a cavity with a through hole is formed in the first upper valve cover, one end of the first valve core penetrates through the cavity in the first upper valve cover and extends into the first membrane head assembly, a through groove is formed in the center of the first valve core, and a first through groove is formed in one side face, located at the end of the bottom, of the first valve core.

Preferably, the second membrane head assembly comprises a second upper membrane cover and a second lower membrane cover fixedly connected with the second upper membrane cover, both ends of the second upper membrane cover and both ends of the second lower membrane cover are of flat plate structures, the middle parts of the second upper membrane cover and the second lower membrane cover are concave, the concave parts of the middle parts of the second upper membrane cover and the second lower membrane cover face each other, a cavity is formed between the middle parts of the second upper membrane cover and the second lower membrane cover, and one end part of the second valve spool extends into the cavity.

Preferably, the first membrane head assembly comprises a first upper membrane cover and a first lower membrane cover fixedly connected with the first upper membrane cover, two end portions of the first upper membrane cover and the first lower membrane cover are both of a flat plate structure, a middle portion of the first upper membrane cover and a middle portion of the first lower membrane cover are concave, the concave portions of the middle portions of the first upper membrane cover and the first lower membrane cover face each other, a cavity is formed between the middle portions of the first upper membrane cover and the first lower membrane cover, and one end portion of the first valve core extends into the cavity.

Preferably, threaded connection has the second nut on the second valve core tip, end face contact has first gasket under the second nut, the lower end face contact of first gasket has the second pressure disk, the second pressure disk joint in on the second valve core tip, just the card pressure has first diaphragm in the second pressure disk, the both ends of first diaphragm are fixed in the second respectively and go up the both ends between the membrane lid and the second down, first diaphragm is the elasticity shell fragment.

Preferably, threaded connection has first nut on one end of the first case, the lower terminal surface contact of first nut has the gasket, the lower terminal surface contact of gasket has first pressure disk, first pressure disk joint in on one end of the first case, just the jam has the diaphragm in the first pressure disk, the both ends of diaphragm are fixed in the both ends between first upper membrane lid and the first lower membrane lid respectively, the diaphragm) is elastic shrapnel.

Preferably, a first connecting hole has been seted up to the upper end of first upper membrane lid, the rigid coupling has a first fixed block on the first connecting hole, the rigid coupling has the pressure gauge on the first fixed block, just a first holding tank has been seted up to the inside of first fixed block, first holding tank with first nut phase-match, the lower terminal surface joint of first case has first piston, first O type circle has been cup jointed on the first piston, first O type circle and first upper valve cover interference fit, the lower extreme joint of first piston has the pressure reduction valve clack, the lower extreme joint of pressure reduction valve clack has first valve gap down, has cup jointed first U type circle on the pressure reduction valve clack, first U type circle and first valve gap internal surface interference fit down.

Preferably, a second connecting hole has been seted up to the upper end of membrane lid on the second, the rigid coupling has a second fixed block on the second connecting hole, the rigid coupling has first pressure gauge on the second fixed block, just a second holding tank has been seted up to the inside of second fixed block, the second holding tank with the second nut phase-match, the lower terminal surface joint of second case has the second piston, the second O type circle has been cup jointed on the second piston, valve cap interference fit on second O type circle and the second, the lower extreme joint of second piston has the pressure release valve clack, the lower extreme joint of pressure release valve clack has the valve gap under the second, has cup jointed second U type circle on the pressure release valve clack, valve gap interference fit is interior surface under second U type circle and the second.

Preferably, the lower end of the second upper valve cover is fixedly connected with a first valve body, the lower end of the first valve body is fixedly connected with a second lower valve cover, a cavity is formed in the second lower valve cover, a second spring is placed in the cavity, one end of the second spring abuts against an inner groove of the pressure relief valve clack, the other end of the second spring is fixedly connected with a second fixed seat, a second adjusting screw is fixedly connected to the second fixed seat, and the second adjusting screw is in threaded connection with the second lower valve cover.

Preferably, the lower end of the first upper valve cover is fixedly connected with a valve body, the lower end of the valve body is fixedly connected with a first lower valve cover, a cavity is formed in the first lower valve cover, a first spring is placed in the cavity, one end of the first spring abuts against an inner groove of the pressure reduction valve clack, the other end of the first spring is fixedly connected with a first fixing seat, a first adjusting screw rod is fixedly connected to the first fixing seat, and the first adjusting screw rod is in threaded connection with the first lower valve cover.

Preferably, the lower end of the second piston exceeds the center line of the first valve body, and the upper end face of the pressure relief valve flap is located on one side, close to the second spring, of the center line of the first valve body.

Compared with the prior art, the utility model, its beneficial effect is: through the setting of this relief valve, small, simple structure to make convenient when maintenance or production, the cost that reduces greatly, in the set pressure within range moreover, if need adjust to 50mm H20 from 100mm H20, the accessible is adjusted and is supplied the adjusting screw at nitrogen valve top, changes the power of spring, can reach the technological value that needs newly to set for.

Drawings

FIG. 1 is a front view of a regulated pressure valve assembly with a nitrogen seal according to the present invention;

fig. 2 is a half sectional view of a second pressure relief valve of a regulated pressure valve assembly with nitrogen seal in accordance with the present invention;

fig. 3 is a half sectional view of a first pressure relief valve assembly of a regulated pressure valve assembly with a nitrogen seal in accordance with the present invention.

In the figure: 10. a second pressure relief valve; 20. a first pressure relief valve assembly; 30. a connecting flange structure; 31. a connecting pipe; 32. a connecting flange; 11. a first pressure gauge; 12. a second fixed block; 13. a second membrane head assembly; 131. a second upper film; 132. a second lower film cover; 14. a first diaphragm; 15. a second upper valve cover; 16. a second O-ring; 17. a first valve body; 18. a second piston; 19. a second valve core; 110. a pressure relief valve flap; 111. a second U-shaped ring; 112. a second spring; 113. a second lower valve cover; 114. a second adjusting screw; 21. a pressure gauge; 22. a first fixed block; 23. a first membrane head assembly; 231. a first upper film; 232. a first lower film cover; 24. a first upper bonnet; 25. a membrane; 26. a valve body; 27. a first O-ring; 28. a first valve spool; 29. a first piston; 210. a pressure reducing valve flap; 211. a first U-shaped ring; 212. a first spring; 213. a first lower valve cover; 214. a first adjusting screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, a regulated pressure valve assembly with a nitrogen seal includes: the pressure relief valve comprises a first pressure relief valve assembly 20, a connecting flange structure 30 communicated with the first pressure relief valve assembly 20 and a second pressure relief valve 10 communicated with the connecting flange structure 30, wherein the connecting flange structure 30 comprises a connecting pipe 31 and a connecting flange 32 communicated with the connecting pipe 31, one end of the connecting pipe 31 is communicated with the first pressure relief valve assembly 20, and the other end of the connecting pipe 31 is communicated with the second pressure relief valve 10;

the second pressure release valve 10 comprises a second upper valve cover 15, a second valve core 19 sleeved in the second upper valve cover 15, and a second membrane head assembly 13 fixed on the second valve core 19, a cavity with a through hole is arranged in the second upper valve cover 15, one end of the second valve core 19 passes through the cavity in the second upper valve cover 15 and extends into the second membrane head assembly 13, a through groove is formed in the center of the second valve core 19, and a second through groove is formed in one side surface of the second valve core 19 located at the bottom end;

the first pressure reducing valve assembly 20 includes a first upper valve cover 24, a first valve core 28 sleeved in the first upper valve cover 24, and a first membrane head assembly 23 fixed on the first valve core 28, a cavity with a through hole is provided in the first upper valve cover 24, one end of the first valve core 28 passes through the cavity in the first upper valve cover 24 and extends into the first membrane head assembly 23, a through groove is provided in the center of the first valve core 28, and a first through groove is provided on a side surface located at the bottom end.

Further, the second membrane head assembly 13 includes a second upper membrane cover 131 and a second lower membrane cover 132 fixedly connected to the second upper membrane cover 131, both ends of the second upper membrane cover 131 and the second lower membrane cover 132 are flat plate structures, a middle portion of the second upper membrane cover 131 and a middle portion of the second lower membrane cover 132 are concave, the concave portions of the middle portions of the second upper membrane cover 131 and the second lower membrane cover 132 face each other, a cavity is formed between the middle portions of the second upper membrane cover 131 and the second lower membrane cover 132, and one end portion of the second valve element 19 extends into the cavity.

Further, the first membrane head assembly 23 includes a first upper membrane cover 231 and a first lower membrane cover 232 fixedly connected to the first upper membrane cover 231, both ends of the first upper membrane cover 231 and the first lower membrane cover 232 are flat plate structures, middle portions of the first upper membrane cover 231 and the first lower membrane cover 232 are concave, the concave portions of the middle portions of the first upper membrane cover 231 and the first lower membrane cover 232 face each other, a cavity is formed between the middle portions of the first upper membrane cover 231 and the first lower membrane cover 232, and one end portion of the first valve element 28 extends into the cavity.

Further, threaded connection has the second nut on 19 tip of second valve core, end face contact has first gasket under the second nut, the lower end face contact of first gasket has the second pressure disk, the second pressure disk joint in 19 tip of second valve core, just the card is pressed in the second pressure disk has first diaphragm 14, the both ends of first diaphragm 14 are fixed in the both ends between second upper membrane lid 131 and the second lower membrane lid 132 respectively, first diaphragm 14 is elastic shrapnel.

Further, threaded connection has a first nut on 28 one end portions of first case, the lower terminal surface contact of first nut has the gasket, the lower terminal surface contact of gasket has first pressure disk, first pressure disk joint in on 28 one end portions of first case, just the jam has diaphragm 25 in the first pressure disk, the both ends of diaphragm 25 are fixed in the both ends between first upper membrane lid 231 and the first lower membrane lid 232 respectively, diaphragm 25 is the elasticity shell fragment.

Further, a first connecting hole has been seted up to the upper end of first upper membrane lid 231, the rigid coupling has a first fixed block 22 on the first connecting hole, the rigid coupling has pressure gauge 21 on the first fixed block 22, just a first holding tank has been seted up to the inside of first fixed block 22, first holding tank with first nut phase-match, the lower terminal surface joint of first case 28 has first piston 29, first O type circle 27 has been cup jointed on the first piston 29, first O type circle 27 and the first 24 interference fit of upper valve cover, the lower extreme joint of first piston 29 has pressure reduction valve clack 210, the lower extreme joint of pressure reduction valve clack 210 has first lower valve cover 213, has cup jointed first U type circle 211 on the pressure reduction valve clack 210, first U type circle and the first internal surface interference fit of lower valve cover.

Further, a second connecting hole has been seted up to the upper end of membrane lid 131 on the second, the rigid coupling has a second fixed block 12 on the second connecting hole, the rigid coupling has first pressure gauge 11 on the second fixed block 12, just a second holding tank has been seted up to the inside of second fixed block 12, the second holding tank with the second nut phase-match, the lower terminal surface joint of second valve core 19 has second piston 18, second O type circle 16 has been cup jointed on

second piston

18, 15 interference fit of valve gap on second O type circle 16 and the second, the lower extreme joint of second piston 18 has pressure release valve clack 110, the lower extreme joint of pressure release valve clack 110 has valve gap 113 under the second, has cup jointed second U type circle 111 on the pressure

release valve clack

110, 113 interference fit of valve gap internal surface under second U type circle 111 and the second.

Further, the lower end of the second upper valve cover 15 is fixedly connected with a first valve body 17, the lower end of the first valve body 17 is fixedly connected with a second lower valve cover 113, a cavity is formed in the second lower valve cover 113, a second spring 112 is placed in the cavity, one end of the second spring 112 abuts against an inner groove of the pressure relief valve flap 110, the other end of the second spring is fixedly connected with a second fixed seat, a second adjusting screw 114 is fixedly connected to the second fixed seat, and the second adjusting screw 114 is in threaded connection with the second lower valve cover 113.

Further, the lower end of the first upper valve cover 24 is fixedly connected with the valve body 26, the lower end of the valve body 26 is fixedly connected with a first lower valve cover 213, a cavity is formed in the first lower valve cover 213, a first spring 212 is placed in the cavity, one end of the first spring abuts against an inner groove of the pressure reduction valve clack 210, the other end of the first spring is fixedly connected with a first fixed seat, the first fixed seat is fixedly connected with a first adjusting screw 214, and the first adjusting screw 214 is in threaded connection with the first lower valve cover 213.

Further, the lower end of the second piston 18 exceeds the center line of the first valve body 17, and the upper end surface of the pressure relief valve flap 110 is located on the side of the center line of the first valve body 17 close to the second spring 112.

The working principle is as follows: when the pressure in the tank rises above a set value, the first pressure relief valve assembly 20 closes and the second pressure relief valve 10 opens, relieving excess pressure in the tank. When the pressure in the tank decreases, the second relief valve 10 is closed, the first relief valve assembly 20 is opened, and nitrogen gas is injected into the tank.

The nitrogen supply (discharge) pressure of the nitrogen sealing device is convenient to set and can be carried out under the condition of continuous production. Within the set pressure range, for example, from 100mm H20 to 50mm H20, the force of the first spring 212 and the second spring 112 can be changed by adjusting the second adjusting screw 114 and the first adjusting screw 214 at the top of the nitrogen supply valve, so as to achieve the new set process value. The same applies to the adjustment of the two pressure relief valves 10.

The number of devices and the scale of the processes described herein are intended to simplify the description of the present invention, and applications, modifications and variations of the present invention will be apparent to those skilled in the art.

While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application suitable for this invention, and further modifications may be readily made by those skilled in the art, and the invention is therefore not limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

1. A regulated pressure valve assembly having a nitrogen seal, comprising:

the pressure relief valve comprises a first pressure relief valve component (20), a connecting flange structure (30) communicated with the first pressure relief valve component (20) and a second pressure relief valve (10) communicated with the connecting flange structure (30), wherein the connecting flange structure (30) comprises a connecting pipe (31) and a connecting flange (32) communicated with the connecting pipe (31), one end of the connecting pipe (31) is communicated with the first pressure relief valve component (20), and the other end of the connecting pipe (31) is communicated with the second pressure relief valve (10);

the second pressure release valve (10) comprises a second upper valve cover (15), a second valve core (19) sleeved in the second upper valve cover (15), and a second membrane head assembly (13) fixed on the second valve core (19), a cavity with a through hole is arranged in the second upper valve cover (15), one end of the second valve core (19) penetrates through the cavity in the second upper valve cover (15) and extends into the second membrane head assembly (13), a through groove is formed in the center of the second valve core (19), and a second through groove is formed in one side surface of the second valve core (19) positioned at the end of the bottom;

the first pressure reducing valve assembly (20) comprises a first upper valve cover (24), a first valve core (28) sleeved in the first upper valve cover (24) and a first membrane head assembly (23) fixed on the first valve core (28), a cavity with a through hole is formed in the first upper valve cover (24), one end of the first valve core (28) penetrates through the cavity in the first upper valve cover (24) and extends into the first membrane head assembly (23), a through groove is formed in the center of the first valve core (28), and a first through groove is formed in one side face, located at the end of the bottom, of the first valve core (28).

2. The regulated pressure valve assembly with nitrogen seal as claimed in claim 1, wherein said second membrane head assembly (13) comprises a second upper membrane cover (131) and a second lower membrane cover (132) fixedly connected to said second upper membrane cover (131), both ends of said second upper membrane cover (131) and said second lower membrane cover (132) are flat plate structures, the middle portion of said second upper membrane cover (131) and said second lower membrane cover (132) is concave, and the second upper membrane cover (131) and the concave portion of the middle portion of said second lower membrane cover (132) are opposite, a cavity is formed between the middle portions of said second upper membrane cover (131) and said second lower membrane cover (132), and one end of said second valve core (19) extends into said cavity.

3. The regulated pressure valve assembly with nitrogen seal as claimed in claim 1, wherein said first membrane head assembly (23) comprises a first upper membrane cover (231) and a first lower membrane cover (232) fixedly connected to said first upper membrane cover (231), both ends of said first upper membrane cover (231) and said first lower membrane cover (232) are of flat plate structure, the middle portions of said first upper membrane cover (231) and said first lower membrane cover (232) are concave, and said first upper membrane cover (231) and said first lower membrane cover (232) are opposite to each other, a cavity is formed between said first upper membrane cover (231) and said first lower membrane cover (232), and one end of said first valve core (28) extends into said cavity.

4. The regulated pressure valve device with nitrogen seal according to claim 1, characterized in that a second nut is connected to one end of the second valve core (19) in a threaded manner, a first gasket is in contact with the lower end face of the second nut, a second pressure plate is in contact with the lower end face of the first gasket, the second pressure plate is clamped on one end of the second valve core (19), a first membrane (14) is clamped in the second pressure plate, two ends of the first membrane (14) are respectively fixed to two ends between the second upper membrane cover (131) and the second lower membrane cover (132), and the first membrane (14) is an elastic sheet.

5. The regulated pressure valve device with nitrogen seal according to claim 1, wherein a first nut is connected to one end of the first valve core (28) in a threaded manner, a gasket is contacted with the lower end face of the first nut, a first pressure plate is contacted with the lower end face of the gasket, the first pressure plate is clamped on one end of the first valve core (28), a diaphragm (25) is clamped in the first pressure plate, two ends of the diaphragm (25) are respectively fixed to two ends between a first upper diaphragm cover (231) and a first lower diaphragm cover (232), and the diaphragm (25) is an elastic sheet.

6. The pressure regulating valve device with nitrogen seal according to claim 5, wherein a first connection hole is opened at the upper end of the first upper membrane cover (231), a first fixed block (22) is fixedly connected to the first connection hole, a pressure gauge (21) is fixedly connected to the first fixed block (22), a first accommodating groove is opened inside the first fixed block (22), the first accommodating groove is matched with the first nut, a first piston (29) is clamped at the lower end face of the first valve core (28), a first O-ring (27) is sleeved on the first piston (29), the first O-ring (27) is in interference fit with the first upper valve cover (24), a pressure reducing valve flap (210) is clamped at the lower end of the first piston (29), a first lower valve cover (213) is clamped at the lower end of the pressure reducing valve flap (210), a first U-shaped ring (211) is sleeved on the pressure reduction valve clack (210), and the first U-shaped ring (211) is in interference fit with the inner surface of the second lower valve cover.

7. The pressure regulating valve device with nitrogen seal according to claim 4, wherein a second connecting hole is opened at the upper end of the second upper membrane cover (131), a second fixed block (12) is fixedly connected to the second connecting hole, a first pressure gauge (11) is fixedly connected to the second fixed block (12), a second accommodating groove is opened inside the second fixed block (12), the second accommodating groove is matched with the second nut, a second piston (18) is clamped to the lower end face of the second valve core (19), a second O-ring (16) is sleeved on the second piston (18), the second O-ring (16) is in interference fit with the second upper valve cover (15), a pressure relief valve flap (110) is clamped to the lower end of the second piston (18), a second lower valve cover (113) is clamped to the lower end of the pressure relief valve flap (110), a second U-shaped ring (111) is sleeved on the pressure relief valve clack (110), and the second U-shaped ring (111) is in interference fit with the inner surface of a second lower valve cover (113).

8. The regulated pressure valve assembly with nitrogen seal as claimed in claim 1, wherein the lower end of the second upper valve cover (15) is fixedly connected with a first valve body (17), the lower end of the first valve body (17) is fixedly connected with a second lower valve cover (113), the second lower valve cover (113) is internally provided with a cavity, a second spring (112) is placed in the cavity, one end of the second spring (112) is abutted against the inner groove of the pressure relief valve flap (110), the other end of the second spring is fixedly connected with a second fixed seat, a second regulating screw (114) is fixedly connected to the second fixed seat, and the second regulating screw (114) is in threaded connection with the second lower valve cover (113).

9. The regulated pressure valve assembly with nitrogen seal as claimed in claim 1, wherein the lower end of the first upper valve cover (24) is fixedly connected with the valve body (26), the lower end of the valve body (26) is fixedly connected with a first lower valve cover (213), the first lower valve cover (213) is internally provided with a cavity, a first spring (212) is placed in the cavity, one end of the first spring is abutted against the inner groove of the pressure reducing valve flap (210), the other end of the first spring is fixedly connected with a first fixed seat, the first fixed seat is fixedly connected with a first regulating screw (214), and the first regulating screw (214) is in threaded connection with the first lower valve cover (213).

10. A regulated pressure valve assembly with nitrogen seal according to claim 7 wherein the lower end of said second piston (18) is beyond the centerline of the first valve body (17) and the upper end face of said pressure relief flap (110) is on the side of the centerline of said first valve body (17) adjacent the second spring (112).