JPH065113B2 - Air operated valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air actuated valve, which controls the supply of fluid to various target devices that are actuated by using a fluid, and reduces the overall size of the device. The connection direction of the air injection pipe to be connected can be freely determined within a certain range, which facilitates downsizing of the target device and piping design.

2. Description of the Related Art Conventionally air-operated valves apply air pressure by sensing the abnormal pressure of the fluid and constantly opening the fluid flow passage with the valve part provided on the piston by the urging force of the piston that is urged in a fixed direction. There is a normally-open air actuated valve that constantly opens the fluid flow passage into a closed state by applying pressure to the piston against the force.

Further, normally, by the urging force of the piston, the flow passage of the fluid is always closed by the valve portion provided on the piston, and the abnormal pressure of the fluid is detected to apply the air pressure to the piston against the urging force. There is a normally closed air operated valve that opens the fluid flow passage from a normally closed state to an open state.

Among the air operated valves, the normally open air operated valve has an air inlet at the upper end of the cylinder and is connected to an injection pipe, so that the height in the vertical direction is high. In addition, since a large number of normally open air operated valves and normally open air operated valves are used at the same time side by side, the fact that the connection direction of the piping is limited to one place restricts the design of the target device to be controlled and This is not preferable because it becomes large in size.

In addition, the fact that the connecting direction of the injection pipe is specified to the side surface, the lower surface, etc. of the cylinder is the same in the normally closed air operated valve, and in this respect, it is the same as the normally open air operated valve described above. It has similar drawbacks.

Further, the conventional normally open air operated valve and the normally closed air operated valve cannot share a member, and the number of members is large, which is uneconomical.

SUMMARY OF THE INVENTION The present invention relates to an air actuated valve in which the above-mentioned drawbacks are eliminated, and the height in the vertical direction is reduced by connecting the air injection pipe to the side surface of the cylinder.

Further, the connecting direction of the air injecting pipe to the cylinder is free within a certain range so that the design of the controlled target device is not restricted and the device can be downsized.

Further, the member can be shared by the normally open air operated valve and the normally closed air operated valve, and the number of members is reduced to obtain an inexpensive product.

Means for Solving the Problems In order to solve the above problems, the present invention constantly opens or constantly opens a fluid passage in a valve portion provided on the piston by the urging force of the piston urged in a fixed direction. By closing the valve and detecting an abnormal pressure of the fluid and applying air pressure to the piston against the biasing force, the fluid flow passage is set to the normally open to closed state or the normally closed to open state. , The control air inlet is formed on the axial side of the cylinder with the piston slidably mounted, and the cylinder and the bonnet connected to the flow passage side of this cylinder are connected via a lock ring, and the cylinder is connected to the bonnet. In addition to being freely rotatable, this cylinder can be connected to the bonnet in the upright state and the upside down state, making it a normally open air operated valve or a normally closed air operated valve. It can be shared.

Further, the cylinder may be one in which an opening is formed at the upper end and the opening is closed by a lid body connected via a connection lock ring.

Operation Since the present invention is configured as described above, in the normally open air actuated valve, the urging force of the piston causes the valve portion connected to the piston to always open the fluid passage. When the abnormal pressure of the fluid is sensed, the air pressure is applied to the piston against the biasing force, so that the fluid flow passage is always opened to closed.

Further, in the normally closed air operated valve, the fluid flow passage is always closed by the valve portion connected to the piston by the urging force of the piston. When the abnormal pressure of the fluid is sensed, the air pressure is applied to the piston against the urging force to change the fluid flow passage from the closed state to the open state.

Further, the air operated valve is configured such that a control air inlet is formed on an axial side surface of a cylinder on which a piston is slidably mounted and the cylinder is rotatable with respect to a bonnet. Therefore, the air injection pipe can be connected to the side surface of the cylinder, and the height in the vertical direction can be reduced. And the direction of rotation of the cylinder 360
In the plane of °, the connection of the piping is free, and the design of the controlled target device is not restricted by the piping of the air injection pipe, and the target device can be downsized.

Further, since the cylinder and the bonnet are connected via a lock ring so that the cylinder can be freely rotated with respect to the bonnet, the cylinder and the bonnet can be firmly connected and smoothly rotated. You can Further, the connecting work between the cylinder and the bonnet can be performed only by inserting one lock ring between the cylinder and the bonnet, and a complicated connecting means is not required.

Further, since the cylinder has a symmetrical shape in the upright state and the inverted state, the cylinder can be shared by the normally open air operated valve and the normally closed air operated valve by reversing the connection position with respect to the bonnet. This reduces the number of members and enables inexpensive manufacturing.

Embodiment An embodiment in which the present invention is applied to a normally open air operated valve will be described below with reference to FIG. Reference numeral (1) is a piston, which is urged in a fixed direction by a pressing spring (3) interposed between the piston and the hood (2). This piston (1) is slidably attached to a cylindrical cylinder (5) via an O-ring (4). A control air injection port (7) for connecting the air injection pipe (6) is formed on a portion of the axial side surface of the cylinder (5) corresponding to the outer surface of the piston (1) in the biasing direction.

Also, by connecting and fixing one end of the cylinder (5) to the bonnet (2) via the lock ring (8),
It is rotatable with respect to the hood (2). this,
The connection by the lock ring (8) is provided with annular grooves each having a semicircular cross section corresponding to the sliding surface of the cylinder (5) and the bonnet (2) to form an annular groove having a circular cross section. Then, an insertion hole (not shown) which is tangentially connected to the annular groove is opened in the cylinder (5). Then, by inserting the lock ring (8) into the annular groove through the insertion hole, the cylinder (5) and the bonnet (2) are in a mutually rotatable state while being surely connected.

Further, the opening (10) at the other end of the cylinder (5) is hermetically closed by rotatably fixing a lid (12) through a connection lock ring (11).

Further, a connection body (14) having a control fluid flow passage (13) is screwed and fixed to the inner circumference of the bonnet (2) via a screw portion (15). And this connection body (14)
The piston rod (16) is inserted therein and a valve portion (17) is provided at the end of the piston rod (16).
This valve part (17) is connected to the opening / closing part (1) of the flow passage (13).
8) so that the flow passage (13) is not normally closed.

A part of the outer circumference of the piston rod (16) is covered with a bellows (20) to protect it from being corroded by the control fluid flowing through the flow passage (13).

Further, a gas intake / exhaust port (21) for advancing / retreating the piston (1) is formed on the side surface of the cylinder (5) on the side of the pressing spring (3).

The cylinder (5) is formed such that the upright shape as shown in FIG. 1 and the upright shape are symmetrical. By forming in this way, it can be used also as the cylinder (5) of the normally closed air actuated valve shown in FIG. 2, and the number of members can be reduced.

In the structure constructed as described above, the pressing spring (3) is normally used.
The valve portion (17) of the piston rod (16) is caused to flow through the control fluid flow passage (1
3) is always open. When an abnormal pressure of the control fluid is detected, the air pressure is applied from the air injection pipe (6) to the piston (1) through the injection port (7) against the urging force, so that the valve portion At (17), the opening / closing part (18) of the flow passage (13) is closed.

In the above embodiments, the present invention has been described as an embodiment in which it is used as a normally open air operated valve. Further, a case where the present invention is used as a normally closed air operated valve will be described below.

In this case, the cylinder (5) is changed from the upright state as shown in FIG. 1 to the inverted state as shown in FIG. Due to this inversion, the portion to which the lid body (12) is fixed is locked to the bonnet (2) by the lock ring (8) in the above embodiment.
Then, the lid body (12) is fixed to the upper end. In addition, the pressing spring (3) is interposed between the lid (12) and the piston (1), and the valve portion (17) is connected to the opening / closing portion (1) of the flow passage (13).
It can be used as a normally-closed air actuated valve by constantly pressing and closing in 8).

When an abnormal pressure of the fluid is sensed by the normally closed air actuated valve, the air pressure is applied to the piston (1) from the inlet (7) against the biasing force of the pressing spring (3). The fluid flow passage (13) is changed from the closed state to the open state.

Also, since the piston rod (16) is slightly different in size from the normally open air operated valve and all other members can be shared, the number of parts is reduced resulting in a normally closed and normally open air operated valve. It is possible to obtain inexpensive products.

EFFECTS OF THE INVENTION As described above, the present invention is such that a control air inlet is formed on the axial side surface of a cylinder in which a piston is slidably mounted, and the cylinder is mounted on a bonnet so as to be rotatable. Therefore, the air injection pipe can be connected to the side surface of the cylinder, and the height in the vertical direction can be reduced.

In addition, the plane of the cylinder rotation direction of 360 ° allows free connection of the air injection pipe, and the design of the controlled target device is not restricted by the piping of the air injection pipe, and the size of the target device is small. It can be transformed.

Further, since the cylinder and the bonnet are connected via the lock ring, the cylinder and the bonnet can be connected easily and firmly and can be rotated smoothly.

Further, since the cylinder has a symmetrical shape in the upright state and the inverted state, the cylinder can be shared by the normally open air operated valve and the normally closed air operated valve by reversing the connection position with respect to the bonnet. This reduces the number of members and enables inexpensive manufacturing.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a sectional view when used for a normally open air operated valve, and FIG. 2 is a sectional view when used for a normally closed air operated valve. (1) ・ ・ ・ ・ ・ ・ Piston (2) ・ Bonnet (5) ・ ・ ・ ・ ・ ・ Cylinder (7) ・ ・ ・ Injection port (8) ・ ・ ・ Lock ring (10) ・ ・ Opening Part (11) ··· Connection lock ring (12) · · Lid body (13) ··· Flow passage (17) · · Valve part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic references Sho 53-133982 (JP, U)

Claims (2)

[Claims] 1. A urging force of a piston urged in a fixed direction to constantly open or close a fluid flow passage in a valve portion provided on the piston and to detect an abnormal pressure of the fluid to urge the air pressure. By adding to the piston against
In the one in which the fluid flow passage is normally open to closed or normally closed to open, a control air inlet is formed on the axial side surface of the cylinder on which the piston is slidably mounted, and the cylinder and this The bonnet connected to the flow passage side of the cylinder is connected via a lock ring to allow the cylinder to rotate with respect to the bonnet, and this cylinder can be connected to the bonnet in an upright state and an inverted state. An air operated valve characterized in that it can be used as an open air operated valve or a normally closed air operated valve. 2. The cylinder according to claim 1, wherein an opening is formed at an upper end of the cylinder and the opening is closed by a lid connected to the connecting lock ring. Air operated valve.