JPS62297911A - Manual opening/closing device for escape valve of pressure reduction/escape valve mechanism - Google Patents

Abstract

PURPOSE:To ensure the normal actuation of a pressure reduction valve mechanism by the function of a pressure-sensitive plate based on the pressure change of a secondary side, by securing such a constitution where the opening amount of an opened escape valve is kept as it is by a pressure reduction valve and interlocks the pressure-sensitive plate when the escape valve is manually opened. CONSTITUTION:When a valve body 40 of an escape valve mechanism 4 is pushed by an action rod 70 of an operating member 7, the upper surface side of a balance piston 31 coupled in a body to a valve body 30 of a pressure reduction valve mechanism 3 forms a gap L with a pressure-sensitive plate 2 at a place between the body 40 interlocking the piston 31 and the plate 2 and a valve seat 41 to secure the interlocking via the rod 70. If the secondary pressure is changed under such conditions, the body 30 moves forward and backward to a valve seat 33 of the mechanism 3 by the movement of the plate 2 caused by the change of said secondary pressure with the gap L kept as it is. Thus it is possible to perform a prescribed pressure reduction action with the mechanism 4 kept open.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a manual opening/closing device for manually opening and closing the pressure relief valve in a pressure reduction/relief valve that integrates a pressure reduction valve and a pressure relief valve. .

Conventionally, there has been no one that integrates a pressure reducing valve and a pressure relief valve, and since there is a demand for this, the applicant of the present invention has developed a pressure reducing valve 9 to meet this demand. When configuring a pressure reduction/relief valve as described above, it is desirable that the relief valve be able to be opened and closed manually in order to check whether the valve is operating normally or not. , as a manual opening/closing device for a relief valve in a pressure reducing table relief valve, as disclosed in Utility Model Application No. 181828/1982 and Japanese Patent Application No. 29840/1983.
Two methods of No. 4 were developed respectively.

The former, as shown in Fig. 1, has a pressure sensitive plate 2 attached to a valve box 1 that is operated by sensing secondary pressure, and is configured to turn on/off communication between the negative side X and the secondary side Y. Valve element 3 of pressure reducing valve mechanism 3
The outer end side of a balance piston 31 connected to the piston 31 is connected to the outer end of the piston 31 so as to be freely releasable.
The pressure-reducing/relief valve A is assembled by providing the valve seat 41 and the valve port 42 on the pressure-sensitive plate 2, and the pressure-reducing spring 5 that biases the pressure-sensitive plate 2 is stored in the spring case 6. It is constructed by assembling an operating member 7 that pulls up the valve seat 41 in a direction opposite to the suppressing direction, and as shown in FIG. When you pull it up, first, the valve body 30 of the pressure reducing valve mechanism 3
is pushed up by the bias of the spring 32 and protrudes onto the valve seat 33 of the pressure-reducing valve mechanism 3 fixed to the valve body 1, and stops rising.The movement of the valve seat 41 of the relief valve mechanism 4, which continues to rise, causes the pressure to rise. When the valve seat 41 is pulled away from the valve element 40 of the relief valve mechanism 4 on the upper surface of the piston 31 which has stopped moving, the relief valve mechanism 4 is forcibly opened.

The latter has a configuration as shown in Figure 2,
A pressure reducing valve mechanism 3 for controlling the opening and closing of communication between the downstream side and a balance piston 31 integrally connected to the valve body 30,
The valve body 30 of this pressure reducing valve mechanism 3 is placed against the pressure sensitive plate 2 assembled to the valve box 1 so as to operate by sensing secondary pressure.
The piston 31 which is integrally connected to the pressure sensitive plate 2 is connected to the pressure sensitive plate 2 by moving it into and out of contact with the pressure sensitive plate 2, and the relief valve mechanism 4 is connected to the connected part, and the valve body 40 of the piston 31 is connected to the pressure sensitive plate 2. A pressure sensitive plate is provided on the upper surface of the piston 31 at the valve seat 41 and the valve port 42. The assembly of the pressure reducing/relief valve A is the same as that shown in FIG.
The operating member 7 to be assembled into the spring case 6 that stores the
By operating it up and down, the above-mentioned balance piston 31
The valve body 40 of the relief valve mechanism 4 installed on the upper surface side is connected to the valve body 40 so as to move up and down.
0 is forcibly pushed in by the operating member 7 and pulled away from the valve seat 41, so that the relief valve mechanism 4 performs a valve opening operation.

By the way, in the former case, when the valve body 30 of the pressure-reducing valve mechanism 3 hits the valve seat 33 and the pressure-reducing valve mechanism 3 is held closed, the above-mentioned valve mechanism 4 Since the relief valve mechanism 4 is opened by moving the valve seat 41 away from the valve body 40, the pressure reducing valve mechanism 3 is closed when the relief valve mechanism 4 is opened by manual operation. In the latter case, when the relief valve mechanism 4 is opened, the balance piston 31 and the valve body 30 of the pressure reducing valve mechanism 3 are pushed downward. As a result, the pressure reducing valve mechanism 3 is forcibly opened and locked in that position, so that it does not operate as a pressure reducing valve. However, there is a drawback that the pressure on the secondary side Y increases until the amount of water flowing in from the pressure reducing valve mechanism 3 in the open state and the amount of water flowing out from the relief valve mechanism 4 in the open state are balanced.

The present invention has been made to solve these problems, and when the relief valve mechanism 4 is opened by manual operation, the pressure reducing valve mechanism 3 The purpose of the present invention is to provide a new means for normal operation through the operation of the .

In the present invention, as a means to achieve this object, a pressure reducing valve mechanism for controlling opening and closing of communication between the upstream side and the secondary side is installed in the valve box with a valve seat fixed to the valve box. It consists of a valve body that moves forward and backward, and a balance piston that is connected to the valve body, and the outer end of the piston is attached to the valve box so that it is activated by sensing secondary pressure. A valve body of a relief valve mechanism is provided on the outer end side of the piston at the connection part, and a valve seat and a valve opening of the relief valve mechanism facing the valve body are connected to the pressure plate so as to be freely detachable from the pressure plate. Installed on the pressure plate to reduce pressure and
A relief valve is constituted, and an actuating member that moves forward and backward with respect to the valve body of the relief valve mechanism is attached to the pressure sensitive plate of the relief valve, and is protruded toward the valve body side, and presses and expands between the valve body and the valve seat. The valve body and the valve seat are held in a retracted state in which they can be brought into close contact, and the operating portion of the operating member is placed on the outer surface of a spring case that houses a pressure reducing spring that biases the pressure sensitive plate. This invention proposes a manual opening/closing device for a relief valve in a pressure reducing/relief valve, which is characterized by a protruding structure.

Next, an example of implementation will be described in detail with reference to the drawings.

Fig. 3 is a vertically sectional front view of a pressure reducing/relief valve A that can implement the present invention, in which 1 is a valve box, 2 is a pressure sensitive plate, 3 is a pressure reducing valve mechanism, 4 is a relief valve mechanism, and 5 is a pressure reducing valve. 6 is a spring case, 7 is an operating member 9 The valve box l is equipped with an inlet pipe 10 on the - side and an outlet pipe 11 on the other side.
is provided, and a pressure sensitive chamber Z communicating with the secondary side Y is provided on the top side.
is the provision. The pressure sensitive plate 2 is assembled on the upper surface side of the valve box 1 so as to cover the pressure sensitive chamber Z, and is fixed to the valve box 1 by a spring case 6 assembled thereon.

The pressure reducing valve mechanism 3 has an open opening at the lower end of a cylindrical part 13 provided in a partition wall 12 that separates the inside of the valve box 1 into a primary side X and a secondary side Y and whose axial direction is the vertical direction. A balance piston is formed on the upper end side of a valve rod 34 that is connected to the valve body 30, and a valve seat 33 is formed on the mouth edge of the valve body 33, a valve body 30 is movably opposed to the valve seat 33 from below, and the valve stem 34 is connected to the valve body 30. 31 as the cylindrical part 1
3, and the upper surface side of the piston 31 is connected to the pressure-sensitive plate 2 so as to be able to move toward and away from the pressure-sensitive plate 2, so that when the pressure on the secondary side Y is high, the pressure reduction spring 5 is biased. When the pressure sensitive plate 2 is pushed upward against the resistance, the valve body 30 moves upward by the return spring 32 and collides with the valve seat 33, resulting in a closed valve state, and the pressure on the secondary side Y decreases. As the pressure sensitive plate 2 is pushed downward by the bias of the pressure reducing spring 5, the valve body 30 moves downward and separates from the valve seat 33 and becomes open/closed. It is controlled by the pressure-sensitive operation of the pressure-sensitive plate 2 due to pressure changes.

The relief valve mechanism 4 is connected to the upper surface side of the piston 31 and the pressure sensitive plate 2.
A valve body 40 is provided on the upper surface side of the piston 31 at the connection site with the pressure sensitive plate 2, and a valve port 42 and a valve seat 41 formed on the edge of the valve port 42 are provided on the pressure sensitive plate 2. 40, and when the valve element 30 of the pressure reducing valve mechanism 3 abuts against the valve seat 33 fixedly provided on the valve box l and its upward movement is fixed. The opening operation is performed by pushing the pressure sensitive plate 2 upward.

The operating member 7 for manually opening the relief valve mechanism 4 has an operating rod 70 fitted and held in a holding member 71 fixedly provided on the upper surface side of the pressure sensitive plate 2 so as to be movable in the axial direction. The inner end 70a of the actuating rod 70 faces the upper surface side of the piston 31 so as to be able to move forward and backward, and a male screw 70b is provided on the circumferential surface of the operating rod 70 at the fitting portion with the holding member 71. 71 is screwed into the internal thread 71a provided on the inner surface of the fitting hole 71, and the outer end of the operating door 0 is made to protrude outside through the through hole opened in the adjustment M60 screwed into the spring case 6. By rotating the protrusion in the forward and reverse directions, the aforementioned inner end 7Oa advances and retreats with respect to the upper surface of the piston 31, thereby causing the valve seat 41 provided on the pressure sensitive plate 2 and the piston 31 to move forward and backward relative to the upper surface of the piston 31 as shown in FIG. An operation is performed to switch between an open state in which the distance between the valve body 40 and the valve body 40 is widened to a predetermined distance, and a closed state in which the distance is zero as shown in FIG.

Next, FIG. 5 shows another embodiment. This example is
The operating rod 70 is held by the holding member 71 in a freely movable manner, is urged by the spring 72 to be pushed toward the valve body 40, and the upper end side of the holding member 71 is moved by the adjustment M60 of the spring case 6.
The through hole provided in the hole is also made to protrude outside, and the outer end of the actuating rod 70 is made to protrude from the protruding end 71b, and the operating lever 73 is pivotally connected thereto. As shown in FIG. 5, the operating lower door 0 is retracted and the valve seat 41 of the relief valve mechanism 4 and the valve body 40 are brought into close contact with each other in the closed state. 73, the actuating rod 70 is pushed out by the spring 72 and the valve is opened to form a predetermined distance between the valve body 40 and the valve seat 41, as shown in FIG. It is.

FIG. 7 shows a modification of the above-mentioned embodiment, in which the operating lever 73 is rotatably supported on the protruding end 71b of the holding member 71 by a connecting shaft 73a, and its base end is outside the operating rod 70. The difference between the distance W between the lower end surface of the proximal end and the connecting shaft 73a, and the distance my between the side surface of the proximal end and the connecting shaft 73a, As the operating lever 73 is rotated up and down, the operating rod 70 moves forward and backward relative to the valve body 40 as shown in FIGS. 8 and 9.

FIG. 10 shows another embodiment similar to the embodiment shown in FIG.
1w and y are reversed from the embodiment shown in FIG. 4, and when the operating lever 73 is stood upright as shown in FIG. The actuating rod 70 is designed to be retracted when it is laid down.

The embodiment device configured as described above operates as follows.

When the operating rod 70 of the operating member 7 is pushed into the valve body 40 of the valve mechanism 4 as shown in FIG. They are held in opposing relational positions with a spacing between them.

In the pressure reducing valve mechanism 3, the upper surface side of the balance piston 31 and the pressure sensitive plate 2 which are integrally connected to the valve body 30 of the pressure reducing valve mechanism 3 are connected to the valve body 40 and the valve seat 41 of the relief valve mechanism 4 which connect them.
and the actuating rod 70 with the aforementioned spacing formed between them.
It will be in a state where it will be connected via.

Therefore, when the secondary pressure changes in this state, the resulting movement of the pressure sensitive plate 2 causes the valve body 30 of the pressure reducing valve mechanism 3 to
The spacing between the valve body 40 and valve 41 of the relief valve mechanism 4 is maintained as is, and the relief valve mechanism 4 is maintained in an open state by moving forward and backward relative to the valve seat 33 of the pressure reducing valve mechanism 3. The predetermined pressure reduction operation will be performed while the

As explained above, the pressure reducing/relief valve according to the present invention includes a pressure reducing valve mechanism that controls opening and closing of communication between the negative side and the secondary side, a valve seat fixed to the valve body, a valve body that moves forward and backward relative to the valve seat, and the valve body that controls the opening and closing of the communication between the negative side and the secondary side. It is provided with a balance piston connected to the body, and the outer end of the piston is removably connected to a pressure-sensitive plate attached to the valve box so as to sense secondary pressure and operate. , a valve body of a relief valve mechanism is provided on the outer end side of the piston at the connecting portion, and a valve seat and a valve port of the relief valve mechanism facing the valve body are provided on the pressure sensitive plate to form a pressure reducing/relief valve. The actuating member that moves forward and backward with respect to the valve body of the valve mechanism is mounted on the pressure sensitive plate thereof, and has a protruding state in which the actuating member that moves forward and backward with respect to the valve body of the valve mechanism protrudes toward the valve body side and presses and expands the space between the valve body and the valve seat, and the valve body. and the valve seat are held in a retracted state in which they can be brought into contact with each other, and the operating portion of the actuating member is protruded to the outside of a spring case housing a pressure reducing spring that biases the pressure sensitive plate. Because of this structure, when the operating member is operated manually to open the relief valve mechanism, the valve body of the pressure reducing valve mechanism maintains the opened relief valve mechanism in that state. Since the relief valve is connected to the pressure sensitive plate, the relief valve is kept closed at a predetermined opening degree and the pressure reduction operation is performed.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the prior art, Figure 3 is a longitudinal sectional front view of a pressure reduction contest relief valve that can implement the present invention, Figure 4 is an explanatory diagram of the action of the same, and Figure 5 is an alternative to the same. FIG. 6 is an explanatory diagram of the action of the above embodiment, FIG. 7 is a longitudinal sectional side view of the main part of the modified example of the above, and FIGS. 8 and 9 are the action of the above. FIG. 10 is a vertical sectional side view of a main part of another embodiment of the same, and FIG. 11 is an explanatory view of the operation of the same. Explanation of drawing symbols A...Pressure reduction/relief valve L...Interval X...-
Firebox Y...Secondary chamber 2...Pressure sensitive chamber 1...
・Valve box 10...Inlet pipe 11...Outlet pipe 12
... Partition wall 13 ... Cylindrical part 2 ... Pressure sensitive plate 3 ... Pressure reducing valve mechanism 30 ... Valve body 3
1...Piston 32...Return spring 33
...Valve seat 34...Valve stem 35...Valve port 4...Relief valve mechanism 40...Valve body 41...
・Valve seat 42...Valve port 5...Spring for pressure reduction 6...Spring case 60...Adjustment lid 7...Operation member 70...Operating rod 7
0a...Inner end 70b...Male thread 71.
...Holding member 71a...Female thread 71b...
・Protruding end 72...Spring 73...Operation lever 73a...Connection shaft support Applicant
NTC Industry Co., Ltd. No. 1 [$2IQ $3m! ! 1st jI5I! I 6th vIA

Claims (1)

[Claims] A pressure reducing valve mechanism that controls the opening and closing of communication between the primary and secondary sides,
It consists of a valve seat fixed to the valve body, a valve body that moves forward and backward relative to the valve seat, and a balance piston connected to the valve body, and the outer end of the piston is connected to the valve body to sense secondary pressure. The valve body of the relief valve mechanism is provided on the outer end side of the piston at the connection part, and the valve body of the relief valve mechanism is opposed to the valve body. A pressure reducing/relief valve is constructed by providing a valve seat and a valve port on the pressure sensitive plate, and an actuating member that moves forward and backward with respect to the valve body of the relief valve mechanism is provided on the pressure sensitive plate, and protrudes toward the valve body side. and a retracted state in which the valve element and the valve seat are brought into close contact with each other, and the operating portion of the actuating member is held in such a manner that the pressure sensitive plate is urged. A manual opening/closing device for a relief valve in a pressure reduction/relief valve, characterized in that a pressure reduction spring is housed and protrudes from the outside of a spring case.