JPH0510468A - Relief opening/closing composite valve - Google Patents

Abstract

PURPOSE:To prevent the generation of chattering and the close contact breakage of a spring by forming a valve body in a cylindrical shape having an annular sealing surface, fitting a piston connected to a valve seat therein to form a damping chamber, and providing a stopper in a spring presser. CONSTITUTION:When a fluid pressure is abnormally increased, a spring 12 is contracted so that a valve body 9 is separated from a valve seat 14, a pressure port 4 communicates with a drain port 5 and the rise of pressure is prevented accordingly. At this time, a fluctuation in pressure or flow rate arises under a pressure near to a setting pressure. Since a piston 17 connected to a valve seat 14 is fitted into the cylindrical valve body 9 to form a damping chamber 16, however, when the fluctuation in pressure is equal to or lower than the internal pressure of the damping chamber 16, the valve body 9 is damped to prevent a chattering. When the fluid pressure is abruptly increased to be equal to or higher than the setting pressure, the valve body 9 is liable to be rapidly elevated. However, a stopper 20 attached to a spring presser 10 above the valve body 9 restricts the elevation of the valve body 9 within a range where the coils of the spring 12 do not come into contact, so that the contact breakage of the spring 12 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined relief / open / close valve having a function of preventing chattering and a spring.

[0002]

2. Description of the Related Art A valve body, a spring and a spring retainer of a relief valve for opening a valve body by pressing a valve seat against a valve seat by a spring to close the valve seat, and opening the valve body when a pressure exceeding the valve closing force of the spring acts on the valve body. A relief / open / close combined valve in which a valve is housed in a case and a screw for adjusting the pressure of the spring and raising the case is connected to the spring retainer is an invention of the present inventor.
It is known from No. 0. This composite valve is unique in that it functions as both a relief valve for safety and an on-off valve for maintenance.

However, in the above-mentioned compound valve, since the valve body is pressed against the valve seat by the spring, when the relief valve operates, if the pressure or flow rate fluctuates in the vicinity of the set pressure, the valve body may be affected. Causes chattering and damages the valve body and seat surface of the valve seat, and when a sudden pressure rise occurs, the valve body suddenly rises until the spring coils collide with each other, causing the spring to be intimately damaged. There is a problem.

[0004]

The problem to be solved by the present invention is to prevent the occurrence of chattering and the contact damage of the spring in the conventional combined valve which doubles as a relief valve and an on-off valve. There is something that cannot be done.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a relief valve is provided in which a valve element is pressed against a valve seat by a spring to close the valve element, and the valve element is opened when a pressure exceeding the valve closing force of the spring acts on the valve element. In a relief / open / close composite valve in which the valve body, the spring, and the spring retainer are housed in a case, and a screw is connected to the spring retainer to adjust the pressure of the spring and pull up the case, the valve body has an annular seat surface. And a piston connected to the valve seat is engaged therein to form a braking chamber for the valve body, and the spring retainer is provided with a stopper for preventing the valve body from opening too much. It is characterized by solving the above-mentioned problems.

[0006]

In the combined relief / open / close valve configured as described above, when the screw is turned by the handle and moved toward the valve seat, the screw pressurizes the spring through the spring retainer, thereby causing the valve body to move to the valve seat. When the pressure contact force is balanced with the fluid pressure to be set, if the screw is stopped and stopped by the stop nut and lock nut, the stop nut will not move even if the valve body is opened or closed. The relief pressure can be set at a constant pressure.

However, when the fluid pressure rises abnormally due to the action of the back pressure of the actuator or the expansion due to the rise of the fluid pressure, the spring contracts to move the valve body away from the valve seat, and the pressure port and the drain. If the fluid pressure falls below the set value, it will communicate with the mouth and discharge a part of the pressure fluid to perform a safety action to prevent the fluid pressure from rising.
The force of the spring causes the valve body to come into contact with the valve seat and close the valve, thus acting as a relief valve for holding the pipe line at the set pressure.

When acting as a relief valve in this way, when pressure fluctuations and flow rate fluctuations occur in the vicinity of the set pressure, in the case of only a spring, chattering in which the valve element sticks to or separates from the valve seat according to the fluctuations. However, since the composite valve of the present invention forms the braking chamber by engaging the pistons connected to the valve seat in the cylindrical valve body, the valve body does not move when the pressure fluctuation is less than the internal pressure of the braking chamber. Do not brake to prevent chattering.

When the fluid pressure rises sharply above the set pressure, the spring tends to cause contact damage and the valve body tends to rise rapidly. However, since there is a stopper attached above the valve body for restraining the spring, the rise of the valve body is limited to the range where the coils of the spring do not come into contact with each other, so that the contact damage of the spring is completely prevented.

Further, if the seat surface of the valve body or the valve seat is formed in a spherical shape as shown in FIGS. 4 and 5, the valve body may be eccentrically closed with respect to the valve seat. Since the seat surface and the seat surface of the valve seat are in close contact with each other, the target liquid will not leak even if it is of high pressure or of low concentration, which is likely to leak.

Next, when this composite valve is used for the maintenance of the pipeline, when the screw is turned in the opposite direction by the handle, the screw retracts to pull the spring restraint, and thereby the case is pulled up. The body rises with the case and moves away from the valve seat, and the pressure port and the drain port are communicated with each other to drain the drain in the pipeline, or conversely, the fluid flows from the drain port through the pressure port into the pipeline. Come to do. However, if the screw is advanced until the stop nut hits the lid after maintenance, the valve body is elastically pressed against the valve seat 5 by the spring to close the valve, and acts as a relief valve for safety. It will be.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a combined relief / open / close valve according to the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional front view showing a valve closed state of an embodiment in which the compound valve of the present invention acts as a relief valve. FIG. 2 is a vertical sectional front view showing the valve open state of the above. FIG. 3 is a vertical sectional front view showing a valve open state of an embodiment in which the combined valve of the present invention acts as an opening / closing valve. FIG. 4 is a partial vertical sectional front view showing an embodiment in which the seat surface of the valve seat is spherical. FIG. 5 is a partial vertical front view showing an embodiment in which the seat surface of the valve element is spherical.

1 to 3, reference numeral 1 denotes a valve box of a combined relief / open / close valve, in which a valve chamber 2 which opens upward is provided.
The opening of the valve chamber 2 is closed by a lid 3, and a pressure port 4 into which the pressure fluid enters and a drain port 5 from which the drain exits are orthogonal to each other in the lower part of the valve chamber 2 or parallel to each other in a vertical direction, or face each other in a stepped manner. It is installed in a state such as by cutting.

Reference numeral 6 designates a case which is fitted in the valve chamber 2 so as to be able to move up and down. The inner lower part of the case is peeped downward from a hole 7 in the bottom, and this part has a tapered shape as shown in FIGS.
As shown in FIG. 5, a cylindrical valve body 9 provided with an annular seat surface 8 having a spherical shape is housed, and a spring retainer 10 is attached to the upper portion by a screw, and the spring retainer 10 and the valve body 9 are attached. A spring 12 is sandwiched between a collar 11 provided on the outer side of the middle, and the spring 12 presses the collar 11 of the valve body 9 against the bottom of the case 6, and the lower peripheral surface communicates the inside of the case 6 with the valve chamber 2. A through hole 13 is provided to allow it.

Reference numeral 14 denotes a valve seat fitted and fixed to the inside of the pressure port 4 of the above-mentioned valve box 1, and for seating the annular seat surface 8 of the above-mentioned tubular valve body 9 in the middle, FIGS. 5 or a spherical seat surface 15 as shown in FIG. 5 is formed. Above the seat surface 15, the cylindrical valve body 9 is fitted into the valve body 9 and the braking chamber is formed in the valve body 9. A piston 17 for forming 16 is connected in series, and a vertical hole 1 provided at the center of the valve seat 14 is provided between the piston 17 and the seat 15.
A communication port 19 that communicates with the pressure port 4 by 3 is provided.

Numeral 20 is a stopper projecting to the lower part of the spring retainer 10 described above, and when the valve body 9 is opened as shown in FIG.
The compression of the spring 12 is restricted to the range where the coils do not come into contact with each other to prevent the contact damage of the spring 12.

Reference numeral 21 denotes a screw penetrating the above-mentioned lid 3, a handle 22 is attached to the outer end, and the spring retainer 10 is connected to the inner end by a rotary joint 23.
When it is rotated in the forward direction, the valve element 9 is pushed by the spring 12 and the annular seat surface 8 is pressed against the seat surface 15 of the valve seat 14, and the valve is closed below the set pressure, but when abnormal pressure occurs It acts as a relief valve that opens.

However, when the screw 21 is turned in the retracting direction, the case 6 is pulled up by the spring retainer 10 and the annular seat surface 8 of the valve body 9 is separated from the seat surface 15 of the valve seat 14 to open the valve. The function of an on-off valve that allows the discharge of water and the reverse flow of fluid can be achieved.

Numerals 24 and 25 are a stop nut and a lock nut screwed to the above-mentioned screw 21, and stop when the spring 12 pressurized by the screw 21 gives a force to the valve body 9 in equilibrium with the set pressure of the fluid. The nut 24 prevents the screw 21 from advancing further by hitting the lid 3, and the lock nut 25 fixes the stop nut 24 so as not to move.

[0021]

As described above, the combined valve of the present invention functions as a relief valve for safety and as an opening / closing valve for maintenance, so that only one valve, which conventionally required two, is sufficient. The production cost and installation cost can be reduced.

Since only the case containing the valve body, the spring and the spring retainer is housed in the valve box, the price, size and shape of the relief valve can be made almost the same.

The valve body is formed into a tubular shape, and a piston connected to the valve seat is engaged with the valve body to form a braking chamber that suppresses the movement of the valve body when pressure fluctuations and flow rate fluctuations occur near the set pressure. Therefore, the valve body does not chatter.

Since the spring retainer is provided with a stopper for preventing the valve body from opening too much, the valve body is restrained at a required opening degree, and the contact damage of the spring does not occur.

If the valve body or the seat surface of the valve seat is formed in a spherical shape, the valve can be reliably closed even if the valve body is eccentrically closed.
It has a unique effect such as.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a valve closed state of an embodiment in which a compound valve of the present invention acts as a relief valve.

FIG. 2 is a vertical sectional front view showing the valve open state of the above.

FIG. 3 is a vertical sectional front view showing an opened state of an embodiment in which the combined valve of the present invention acts as an opening / closing valve.

FIG. 4 is a partial vertical sectional front view showing an embodiment in which the seat surface of the valve seat is spherical.

FIG. 5 is a partial vertical sectional front view showing an embodiment in which the valve body has a spherical seat surface.

[Explanation of symbols]

7 cases 9 valve body, 10 Spring restraint 12 springs 14 seat 21 screws

Claims (2)

[Claims] Claim: What is claimed is: 1. A valve body, a spring, and a spring retainer for a relief valve, wherein a valve body is pressed against a valve seat by a spring to close the valve, and the valve body is opened when a pressure exceeding the valve closing force of the spring acts on the valve body. In a relief / open / close composite valve in which a valve is housed in a case, and a screw for adjusting the pressure of the spring and pulling up the case is connected to the spring retainer, the valve body is formed into a tubular shape having an annular seat surface, and Relief / open / close combination characterized in that a piston connected to a valve seat is engaged therein to form a braking chamber for the valve body, and the spring retainer is provided with a stopper for preventing excessive opening of the valve body. valve. 2. A combined relief / open / close valve in which the seat surface of the valve element or the valve seat is formed in a spherical shape.