JP2002168367A - Reversible pilot type solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reversible pilot type solenoid valve for opening and closing a passage where similar large currents flow both in the normal and reverse directions using a single electromagnetic coil. SOLUTION: Between an inlet/outlet passage of fluid and a chamber for disposing a piston integrally provided with a valve member provided with a main valve and a pilot valve seat, check valves each provided with a pressure communication hole are provided. Low pressure is applied to a lower surface of a pilot valve element in either flow of fluid by a lip packing and a pilot port provided on a shuttle valve and a valve member. High pressure is applied to an upper surface of the pilot valve element from the check valve on the fluid inlet side through the chamber. Since a seal area at a pilot valve seat is small, a pilot valve can be actuated by small electromotive force even when differential pressure of fluid is large, and a large capacity current can be controlled at low actuation pressure for either flow direction, normal or reverse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversible pilot type solenoid valve used for a path for supplying various gaseous fluids, and more particularly, to a reversible pilot type solenoid valve for controlling a large amount of fluid flowing in forward and reverse directions. It relates to a solenoid valve.

[0002]

2. Description of the Related Art Conventionally, many reversible pilot solenoid valves have been proposed. For example, Japanese Utility Model Publication No. 57-19907
Gazette, Japanese Utility Model Laid-Open No. 60-134980,
-132131.

[0003]

However, in the conventional reversible pilot type solenoid valve, Japanese Utility Model Publication No. 57-19907
Japanese Patent Application Laid-Open No. 60-134980 and JP-A-60-134980, when a high fluid pressure (reverse pressure) acts on the lower surface of the main valve body and the pilot valve body, this high pressure If the springs over the main valve body and the pilot valve body are overcome, the valve will close even when the electromagnetic coil is not energized, so that the working pressure difference has been limited. On the other hand, JP
-132131 has a complicated overall structure, such as a large number of pressure flow holes and a large number of plugs for closing (six places). In addition, the pressure flow path from the inlet / outlet to the upper part of the main valve body is long, so there is a lot of pressure loss. In particular, there are problems in valve leakage and response at low pressure.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems in the conventional reversible pilot type solenoid valve, and when operating the pilot valve by energizing the electromagnetic coil, a fluid is used. Non-return valves each having a pressure communication hole are provided between the inlet and outlet passages and a chamber for disposing a piston integrally provided in a valve member having a main valve and a pilot valve seat. On the lower surface of the pilot valve body, a low pressure is applied in any flow of the fluid by the shuttle valve and the lip packing and the pilot port provided on the valve member, and on the upper surface of the pilot valve body, a check valve on the inlet side of the fluid is provided. High pressure is applied to the pilot valve body through the chamber from above, and since the sealing surface of the pilot valve seat is small, the differential pressure of the fluid is large due to a small electromotive force. The pilot valve operates, and in either the forward or reverse flow direction, there is no pressure difference limit at the time of valve closing, and the pressure flow path from the inlet / outlet passage to the chamber, which is the upper space of the main valve body, is shortened. It is another object of the present invention to provide a reversible pilot-type solenoid valve that has no valve leakage and good responsiveness during low operation.

That is, a first invention is a reversible pilot type solenoid valve in which a pilot valve is operated by energizing an electromagnetic coil and a main valve body is opened by a pressure difference of a fluid. Is provided with a main valve seat 4 between the entrance passage 2 and the entrance passage 3 and a chamber A5 for disposing a piston at an upper portion thereof.
Is provided with a ring-shaped vertical hole 6a, and a horseshoe-shaped vertical hole 6b communicating with the vertical hole 6a and the entrance / exit passage 2 is provided.
And a sliding hole 8 for sliding the axis of the valve member 14 in the vertical direction at the bottom of the vertical hole 7. 2 and a horizontal hole 9 for inserting a shuttle valve communicating with the entrance / exit passage 3, and the horizontal hole 9 has a shuttle valve seat 9a, 9b.
A check valve 11 having a valve body 11a and a pressure flow hole 11b is provided in a flow passage 10 that communicates with the entrance / exit passage 2 and the chamber A5, and a flow passage that communicates with the entrance / exit passage 3 and the chamber A5. 12 has a valve body 13
and a check valve 13 provided with a pressure flow hole 13b. A valve member 14 disposed in the vertical hole 7 has a pilot port 15 provided at the shaft center and a pilot valve seat 16 provided at the upper end of the shaft. And a main valve body 17 formed in a convex shape, and a cylindrical portion 19 of a piston 18 is integrally fixed to the convex portion of the main valve body 17 by press fitting or the like. A cylindrical hole 19 is provided with a lateral hole 20 and a seal ring 21 is fitted on the outer peripheral edge of the flange. The upper opening of the valve body 1 is provided with a chamber B22 in the center of the lower surface. The shuttle 23 provided with an O-ring 32 is slidably provided in the horizontal hole 9 for inserting the shuttle valve, while the electromagnetic coil portion 24 is provided with a plan. Jar tube 25 and suction element 2
6, a spring 27, a plunger 29 having a pilot valve body 28 at a lower end thereof, a coil 30 and a magnetic pole plate 31, and a flange 28 a provided at a lower end of the plunger 28 is formed in a cylindrical shape of the piston 18. A reversible pilot-type solenoid valve characterized by being locked to a portion 19. According to the present invention, on the lower surface of the pilot valve body,
A low pressure is applied in any flow of the fluid by the lip packing and the pilot port provided on the shuttle valve and the valve member, and a pilot valve is formed on the upper surface of the pilot valve through the chamber from the check valve on the fluid inlet side through the chamber. The pilot valve operates even if the differential pressure of the fluid is large due to the small electromotive force, and has a large capacity at a low operating pressure in both forward and reverse flow directions. Flow rate can be controlled.

A second invention is directed to a vertical hole 7 serving as a main valve port.
2. The reversible pilot solenoid valve according to claim 1, wherein the cross-sectional area of the ring-shaped vertical hole 6a is larger than the cross-sectional area of. According to the present invention, the resistance of the fluid flowing from the inlet / outlet 2 or 3 of the fluid to the valve port can be reduced.

According to a third aspect of the present invention, there is provided a reversible pilot-type solenoid valve according to claim 1, wherein a lip packing 15a is provided at a lower end of the shaft of the valve member 14. According to the present invention, the space below the lip packing 15a can always be kept at a low pressure (outlet pressure) by interaction with the shuttle valve 33.

Further, according to a fourth aspect of the present invention, the seal ring 21 incorporated in the piston 18 has a donut-shaped portion cut into a C-shape. Formed pilot port 1
The reversible pilot solenoid valve according to claim 1, wherein the cross-sectional area is smaller than the cross-sectional area of (5). According to the invention,
When the pilot valve opens, the piston upper space 5a
Can be made lower in pressure than the piston lower space 5b.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure of a reversible pilot type solenoid valve according to the present invention will be described with reference to the drawings. FIG.
1 is a longitudinal sectional view of a reversible pilot solenoid valve according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

The reversible pilot type solenoid valve according to the present invention is such that the pilot valve is operated by energizing an electromagnetic coil and the main valve body is opened by a pressure difference of a fluid. The solenoid valve includes a main body 1, a valve member 14 provided with a main valve, two check valves 11 and 13,
It comprises a pilot valve element 28, an electromagnetic coil section 24 and a shuttle valve 33.

The valve body 1 includes an entrance passage 2 and an entrance passage 3
A main valve seat 4 is provided between the first and second chambers, and a chamber A5 is formed in the upper opening, and a piston 18 described later is disposed in the chamber A5. Further, a ring-shaped vertical hole 6a extending through 360 ° is provided around the main valve seat 4 by milling or the like, and a lower portion of the ring-shaped vertical hole 6a is provided with the inlet by electric discharge machining or the like. A horseshoe-shaped vertical hole 6b (see FIG. 2) communicating with the passage 2 is provided. A vertical hole 7 communicating with the entrance / exit passage 3 is provided in the center of the valve body 1. Further, a valve member 14 to be described later is provided at the bottom of the vertical hole 7.
Is provided with a sliding hole 8 for sliding the shaft in the vertical direction.

A horizontal hole 9 for inserting a shuttle valve, which is provided at right angles to the sliding hole 8, communicates with the entrance / exit passage 2 and the entrance / exit passage 3, and has a shuttle valve seat 9 at two locations.
a, 9b are provided. And in the said side hole 9,
A shuttle valve 33 fitted with an O-ring 32 is slidably provided in the left-right direction so that one shuttle valve seat 9a or 9b is closed by the high pressure of the entrance passage 2 or 3.

The flow passage 10 communicates with the inlet / outlet passage 2 and the chamber A5 to maintain the piston upper space 5a and the piston lower space 5b at a high pressure when the valve is closed. The check valve 11 is fixed to the flow passage 10 by press fitting or the like. The check valve 11 includes a valve body 11a and a pressure communication hole 11b. A valve body 13 is provided in the flow passage 12 communicating with the entrance passage 3 and the chamber A5.
A check valve 13 having a and a pressure flow hole 13b is provided. The check valve 13 has the same function as the check valve 11 described above.

The valve member 14 is disposed in the vertical hole 7. The valve member 14 has a pilot port 15 provided at the shaft center and a pilot valve seat 16 provided at the upper end of the shaft in a convex shape. The formed main valve element 17 is provided. Also,
A rubber packing (no reference numeral) is fixed to the lower surface of the main valve body 17.

The cylindrical portion 19 of the piston 18 is press-fitted into the convex portion of the main valve body 17 and fixed integrally therewith. A pilot valve is opened on the cylindrical portion 19 of the piston 18. A lateral hole 20 for guiding the low pressure of the high-lot port 15 to the upper space 5a of the piston when the valve is opened is provided, and a seal ring 2 is provided on the outer peripheral edge of the piston flange.
1 is provided by fitting.

The above-mentioned seal ring 21 is formed in a C-shape by cutting one part of a donut shape. The cross-sectional area of the cut gap is larger than the cross-sectional area of the pilot port 15 formed in the valve member 14. When the pilot valve is opened, the piston head space 5
a is lower than the piston lower space 5b.

The lid 23 is for hermetically covering the upper opening of the valve body 1 with an O-ring (no symbol), and a chamber B22 is provided in the center of the lower surface of the lid 23, The lowermost surface of the body 23 serves as a stopper for the flange portion of the piston 15.

The electromagnetic coil section 24 is composed of a plunger tube 25, a suction element 26, a spring 27, a plunger 29 having a pilot valve body 28 at a lower end, a coil 30, and a magnetic pole plate 31. Further, a flange 28a provided at the lower end of the plunger 28 can be locked to the cylindrical portion 19 of the piston 18. When a current is supplied to the coil 30, a force for lifting the piston 18 acts. It has become.

[0019]

Next, the operation of the reversible pilot solenoid valve of the present invention will be described with reference to FIGS.

First, the operation of the forward flow will be described. The valve closes when the electromagnetic coil 30 is not energized (the state shown in FIG. 1)
are doing. This state will be described. The high-pressure fluid flowing from the inlet / outlet passage 2 causes the check valve 11 on the high-pressure side (inlet side).
Is opened, and a high pressure (inlet pressure) is introduced into the piston lower space 5b through the pressure flow hole 11b. The high pressure (inlet pressure) in the lower piston space 5b is introduced into the upper piston space 5a through a small gap of a cut groove formed in the donut-shaped seal ring 21. On the other hand, the check valve 13 on the low pressure side (outlet side) communicating with the inlet / outlet passage 3 is closed due to the pressure difference between the piston lower space 5b and the inlet / outlet passage 3 (low pressure). In other words, the pressure in the piston upper space 5a and the piston lower space 5b is high (inlet pressure) by the action of the two check valves 11 and 13 described above.

The shuttle valve 33 is provided on the high pressure side (inlet side).
Due to the pressure difference between the entrance / exit passage 2 and the entrance / exit passage 3 on the low pressure side (exit side), it is moving to the left, the high pressure side (inlet side) is closed, and the low pressure side (exit side) is opened. Therefore, the space below the lip packing 15a is always at a low pressure (outlet pressure).

The ring-shaped vertical hole 6a has a high pressure (inlet pressure).
The vertical hole 7 provided in the axis of the valve body 1 has a low pressure (outlet pressure).
It is. That is, the piston upper space 5a above the seal ring 21 has a high pressure, and the piston lower space 5b and the ring-shaped vertical hole 6
Although a is high pressure, since the vertical hole 7 provided in the axis of the valve body is low pressure, there is less high pressure part than the upper part of the seal ring 21, and a pressure difference is generated in the space above and below the seal ring 21, Has generated a downward force. A lowering force of a spring 27 and a lowering force of a spring 34 disposed between the upper lid 23 and the piston 15 are acting on the piston 18 via a plunger 29.

At this time, assuming that the force acting downward is positive, the relation of (differential pressure acting on piston 18) + (load of spring 27) + (load of spring 34) ≧ 0 holds the valve closed state. are doing.

Next, the valve opens when the electromagnetic coil 30 is energized. This operation will be described. When the electromagnetic coil 30 is energized, the electromagnetic force of the electromagnetic coil 30 is changed to “the sealing force between the pilot valve body 28 and the pilot valve seat 16” and “springs 27 and 3”.
When the "combined force" of the load 4 is overcome, the plunger 29 is sucked by the suction element 26 and rises until it comes into contact with the tapered hooking portion (locking portion) formed on the cylindrical portion 19 of the piston. At this time, the pilot valve body 28 also moves up, leaves the pilot valve seat 16, and the pilot port 15 is opened. Further, since the space below the lip packing 15a is always at a low pressure (outlet pressure), the piston upper space 5a
Pressure escapes from the lateral hole 20 formed in the cylindrical portion through the pilot port 15 to the space below the lip packing 15a. At this time, the high pressure (inlet pressure) is introduced into the piston lower space 5b through the check valve 11, but the cross-sectional area of the pilot port 15 is larger than the cross-sectional area of the cut gap of the seal ring 21. In the upper piston space 5a, the amount of pressure flowing out to the pilot port 15, which is a low pressure portion, is larger than the amount of high pressure introduced from the lower piston space 5b. Therefore, the pressure in the piston upper space 5a decreases, and the pressure in the piston upper space 5a becomes lower than the pressure in the piston lower space 5b.

The ring-shaped vertical hole 6a has a high pressure (inlet pressure).
The vertical hole 7 provided in the axis of the valve body 1 has a low pressure (outlet pressure).
It is. That is, the pressure above the seal ring 21 becomes the same low pressure as the vertical hole 7, and this low pressure acts on the upper surface of the main valve body 17, and the ring-shaped vertical hole 6a
The high pressure acts on the piston 18 which is provided integrally with the main valve body 17 due to this differential pressure. In addition, the rising force by the electromagnetic force of the electromagnetic coil 30 acts on the piston 18 via the plunger 29. Therefore, the resultant force of the two rising forces is “the descending force of the spring 27 and the spring 34” and “the seal ring 21,
When the sliding resistance "the resultant force" of the lip packing 17a and the lip packing 15a is overcome, the piston 18 rises,
Open the valve.

As described above, once the valve is opened, the body 1
The internal pressure becomes substantially the same, and the rising force due to the pressure difference in the piston 18 disappears. However, since the rising force by the electromagnetic force of the electromagnetic coil 30 is larger than the falling force of the springs 27 and 34, the piston 18 keeps the valve open.

Next, when the electromagnetic coil 30 is de-energized, the valve is closed. Describing this operation, the rising force due to the electromagnetic force of the electromagnetic coil 30 disappears, and only the descending force of the springs 27 and 34 remains, so that the piston 18 descends and closes. Then, the state returns to the state of paragraph [0020].

Next, the operation of the backward flow will be described. When the electromagnetic coil 30 is not energized, the valve is closed. Describing this state, the check valve 13 on the high pressure side (the entrance / exit passage 3 side) is opened, and high pressure (inlet pressure) is introduced into the piston lower space 5b through the pressure flow hole 13b. The high pressure (inlet pressure) in the lower piston space 5b is introduced into the upper piston space 5a through a small gap of a cut groove formed in the donut-shaped seal ring 21. On the other hand, doorway 2
The check valve 11 on the low pressure side (outlet side) communicating with the valve is closed due to the pressure difference between the piston lower space 5b and the inlet / outlet passage 3 (low pressure). In other words, the pressure in the piston upper space 5a and the piston lower space 5b is high (inlet pressure) by the action of the two check valves 11 and 13 described above.

The shuttle valve 33 is connected to the high pressure side (inlet side).
Due to the pressure difference between the entrance / exit passage 3 and the entrance / exit passage 2 on the low pressure side (exit side), it moves to the right, closes the high pressure side (inlet side), and opens the low pressure side (exit side). I have. Further, since the lip packing 15a prevents the high pressure in the inlet / outlet passage 3 from flowing into the space below the lip packing 15a, this space always has a low pressure (outlet pressure).

The ring-shaped vertical hole 6a has a low pressure (outlet pressure).
The vertical hole 7 provided in the axis of the valve body 1 has a high pressure (inlet pressure).
It is. That is, the piston upper space 5a above the seal ring 21 has a high pressure, and below the seal ring 21, the piston lower space 5b and the vertical hole 7 provided in the axis of the valve element have a high pressure, but the ring-shaped vertical hole. 6a is a low pressure, so there is less high pressure part than the upper part of the seal ring 21,
A pressure difference is generated between the upper and lower spaces of the seal ring 21, and a downward force is generated on the piston 18. A spring 2 is connected to the piston 18 via a plunger 29.
7 and a lowering force of a spring 34 disposed between the upper lid 23 and the piston 15 are applied.

At this time, assuming that the downward force is positive, the relationship of (differential pressure acting on piston 18) + (load of spring 27) + (load of spring 34) ≧ 0 holds the valve closed state. are doing.

Next, when the electromagnetic coil 30 is energized, the valve is opened. This operation will be described. When the electromagnetic coil 30 is energized, the electromagnetic force of the electromagnetic coil 30 is changed to “the sealing force between the pilot valve body 28 and the pilot valve seat 16” and “springs 27 and 3”.
When the "combined force" of the load 4 is overcome, the plunger 29 is sucked by the suction element 26 and rises until it comes into contact with the tapered hooking portion (locking portion) formed on the cylindrical portion 19 of the piston. At this time, the pilot valve body 28 also moves up, leaves the pilot valve seat 16, and the pilot port 15 is opened. Further, since the space below the lip packing 15a is always at a low pressure (outlet pressure), the piston upper space 5a
Pressure escapes from the lateral hole 20 formed in the cylindrical portion through the pilot port 15 to the space below the lip packing 15a. At this time, a high pressure (inlet pressure) is introduced into the piston lower space 5 b through the check valve 13, but the cross-sectional area of the pilot port 15 is larger than the cross-sectional area of the cut gap of the seal ring 21. In the upper piston space 5a, the amount of pressure flowing out to the pilot port 15 which is a low pressure portion is larger than the amount of high pressure introduced from the lower piston space 5b. Therefore, the pressure in the piston upper space 5a decreases, and the pressure in the piston upper space 5a decreases.
It becomes lower than the pressure of b.

The vertical hole 7 provided in the axis of the valve body 1 has a high pressure (inlet pressure), and the ring-shaped vertical hole 6a has a low pressure (outlet pressure).
It is. That is, the pressure difference between the piston upper space 5a above the seal ring 21, the piston lower space 5b below the seal ring 21, the ring-shaped vertical hole 6a and the vertical hole 7 provided at the axis of the valve body. Arises, piston 1
8 generates a lifting force. In addition, the rising force due to the electromagnetic force of the electromagnetic coil 30 is applied to the piston 1 via the plunger 29.
8 also working. Therefore, when the resultant force of the two rising forces overcomes the "combined force of" the descending force of the spring 27 and the spring 34 "and" the sliding resistance of the seal ring 21, the lip packing 17a, and the lip packing 15a ", the piston 18 Ascends and opens the valve.

As described above, once the valve is opened, the body 1
The internal pressure becomes substantially the same, and the rising force due to the pressure difference in the piston 18 disappears. However, since the rising force by the electromagnetic force of the electromagnetic coil 30 is larger than the falling force of the springs 27 and 34, the piston 18 keeps the valve open.

Next, when the electromagnetic coil 30 is de-energized, the valve is closed. Describing this operation, the rising force due to the electromagnetic force of the electromagnetic coil 30 disappears and only the descending force of the springs 27 and 34 remains, so that the piston 15 descends and closes. Then, the state returns to the state of paragraph [0028].

[0036]

According to the reversible pilot type solenoid valve according to the present invention, the pressure passage holes are provided between the fluid inlet and outlet passages and the chamber provided with the piston provided integrally with the valve member. In addition to the check valve, the shuttle valve and the lip packing provided on the valve member and the pilot port act on the lower surface of the pilot valve body to apply a low pressure in any flow of fluid, and the upper surface of the pilot valve body High pressure is applied to the pilot valve body from the check valve on the inlet side of the pilot valve through the chamber, and since the seal area of the pilot valve seat is small, the solenoid valve is operated by a small electromotive force. The pilot valve operates even if the differential pressure is large, and the large flow rate can be controlled with low operating pressure in both forward and reverse flow directions. Is shall.

The resistance of the fluid flowing from the fluid inlet / outlet 2 or 3 to the valve port can be reduced by making the cross-sectional area of the ring-shaped vertical hole (6a) larger than the cross-sectional area of the vertical hole 7 serving as the main valve port. Therefore, it is a pilot type solenoid valve for large flow rate control at low differential pressure.

Further, by providing the lip packing 15a at the lower end of the shaft of the valve member 14, the space below the lip packing 15a can always be reduced in pressure by interaction with the shuttle valve 33.

Further, the sectional area of the gap cut by the seal ring 21 incorporated in the piston 18 is determined by the valve member 1.
By making the cross-sectional area smaller than the cross-sectional area of the pilot port 15 formed at 4, when the pilot valve is opened, the pressure in the piston upper space 5a can be made lower than that in the piston lower space 5b.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a reversible pilot solenoid valve according to the present invention.

FIG. 2 is a vertical sectional view taken along the line AA of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Valve main body 2, 3 Inlet passage 4 Main valve seat 5 Chamber A 5a Piston upper space 5b Piston lower space 6a Ring-shaped vertical hole 6b Horseshoe-shaped vertical hole 7 Vertical hole 8 Sliding hole 9 Side hole 9a, 9b Shuttle valve seat 10 Flow passage DESCRIPTION OF SYMBOLS 11 Check valve 11a Valve body 11b Pressure passage hole 12 Flow passage 13 Check valve 13a Valve body 13b Pressure passage hole 14 Valve member 15 Pilot port 16 Pilot valve seat 17 Main valve body 17a Lip packing 18 Piston 19 Cylindrical part 20 Side hole DESCRIPTION OF SYMBOLS 21 Seal ring 22 Chamber B 23 Lid 24 Electromagnetic coil part 25 Plunger tube 26 Attractor 27 Spring 28 Pilot valve body 29 Plunger 30 Coil 31 Magnetic pole plate 32 O ring 33 Shuttle valve 34 Spring.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H056 AA03 BB05 BB32 CA01 CD06 EE01 3H058 AA04 BB22 BB40 CC01 CD27 3H106 DA07 DA13 DA23 DA35 DA36 DB02 DB12 DB23 DB32 DC02 DD03 EE22 EE34 GB06 GB08 GB10 GB19

Claims (4)

[Claims] 1. A reversible pilot solenoid valve in which a pilot valve is operated by energizing an electromagnetic coil and a main valve body is opened by a pressure difference of a fluid. A main valve seat (4) is provided between (2) and the inlet / outlet passage (3), and a chamber A (5) for disposing a piston is provided at an upper portion. Around the main valve seat (4) A ring-shaped vertical hole (6a) is provided, and a horseshoe-shaped vertical hole (6b) communicating with the vertical hole (6a) and the entrance / exit passage (2) is provided. In the center of the valve body (1), A vertical hole (7) communicating with the entrance passage (3) is provided, and a valve member is provided at the bottom of the vertical hole (7).
A sliding hole (8) for sliding the shaft of (14) in the vertical direction is provided. Further, the shaft is orthogonal to the sliding hole (8) and is provided in the entrance passage (2) and the entrance passage (3). A communicating horizontal hole (9) for inserting a shuttle valve is provided, and a shuttle valve seat is provided in the horizontal hole (9).
(9a) and (9b) are provided, and a flow passage (10) communicating with the inlet / outlet passage (2) and the chamber A (5) is provided with a check body provided with a valve body (11a) and a pressure flow hole (11b). A valve (11) is provided and the entrance / exit passage is provided.
A check valve provided with a valve body (13a) and a pressure flow hole (13b) is provided in a flow passage (12) communicating with (3) and the chamber A (5).
(13), a valve member (14) disposed in the vertical hole (7) includes a pilot port (15) provided at the shaft center, and a pilot valve seat (16) provided at the upper end of the shaft. Main valve body (17) formed in a convex shape
And a cylindrical portion (19) of a piston (18) is integrally fixed to the convex portion of the main valve body (17) by press-fitting or the like, and a cylinder of the piston (18) is provided. The horizontal hole (2)
0) is provided, and a seal ring (21) is fitted to the outer peripheral edge of the flange. The upper opening of the valve body (1) is provided with a chamber B (22) in the center of the lower surface. A lid (23) is provided in an airtight manner. An O-ring (32) is provided in the horizontal hole (9) for inserting the shuttle valve.
A shuttle valve (33) formed by fitting a solenoid valve is slidably provided.
(25), a suction element (26), a spring (27), a plunger (29) having a pilot valve body (28) at the lower end, a coil (30), and a magnetic pole plate (31).
A reversible pilot solenoid valve, wherein a flange (28a) provided at a lower end of the plunger (28) is engaged with a cylindrical portion (19) of the piston (18). 2. The reversible pilot solenoid valve according to claim 1, wherein the cross-sectional area of the ring-shaped vertical hole (6a) is larger than the cross-sectional area of the vertical hole (7) serving as the main valve port. 3. A lip packing 1 is provided at the lower end of the shaft of the valve member 14.
The reversible pilot type solenoid valve according to claim 1, wherein 5a is provided. 4. A seal ring 21 incorporated in a piston 18 has a C-shape formed by cutting one part of a donut shape.
2. The reversible pilot-type solenoid valve according to claim 1, wherein the cross-sectional area of the pilot port 15 is smaller than that of the pilot port.