JPH0410090B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure reduction/relief valve that integrates a pressure reduction valve and a pressure relief valve.

Pressure reducing valves and pressure relief valves are usually manufactured separately, but when used, they are often paired and used together, so the pressure reducing valve and pressure relief valve are integrated. something is desired.

However, none have been put to practical use, and in particular, pressure reducing valves using cylindrical valves are not known because it is difficult to incorporate relief valves.

The present invention has been made in response to the above-mentioned demand, and includes a relief valve in a pressure reducing valve using a cylindrical valve, while ensuring that the pressure reducing valve performs a predetermined function accurately. It is an object of the present invention to provide a built-in means for reliably performing an operation to release pressure when pressure is generated.

Next, embodiments will be described in detail with reference to the drawings.

FIG. 1 is a vertically sectional front view of a cylindrical valve type pressure reducing/relief valve A in which the present invention can be implemented, in which a is a valve box, 1 is a primary chamber, 2 is a secondary chamber, and 3 is a primary chamber 1. A pressure reducing valve seat provided on the side, 4 is a cylindrical pressure reducing valve whose tip 4a faces the pressure reducing valve seat 3 so as to be movable forward and backward;
is a pressure-sensitive plate that operates by sensing the pressure on the secondary chamber 2 side,
Reference numeral 6 designates a spring case that accommodates a spring F1 that pushes back the pressure sensitive plate 5 so as to face the pressure on the secondary chamber 2 side (secondary pressure).

The valve box a has a primary chamber 1 and a secondary chamber 2 thereof.
In addition, spring cases 6 are formed separately, and a cup-shaped spring case 6 in an inverted position is fixed to the lower surface of the primary chamber 1; The secondary chamber 2 is configured in a valve box a which is integrally connected by being fixed by set screws 20.

The primary chamber 1 of the valve box a is provided with a connecting pipe portion 11 serving as a fluid inlet 10 on one side of the left and right sides of the upper surface, and a cylinder for assembling the pressure adjustment screw 7 on the other side of the upper surface. The portions 12 are installed with their axial directions aligned in the vertical direction. The pressure reducing valve seat 3 is integrally attached to the lower surface of the pressure adjusting screw 7, which is screwed into the cylindrical portion 12 in a plug-like manner and is displaced up and down by rotation. Further, on the bottom wall 1a of the primary chamber 1, a fitting cylindrical portion 13 is provided at a portion located below the cylindrical portion 12.
is formed so that its axis is aligned with the axis of the cylindrical portion 12, and the body of the cylindrical valve 4, which is formed into a cylindrical shape, is placed in the inner cavity of the fitting cylindrical portion 13. It is fitted so that it can be slid up and down while keeping it watertight.

The spring case 6 can be formed into an inverted cup shape.
A through hole 60 that fits into the outer periphery of the fitting cylindrical part 13 provided in the bottom wall 1a of the primary chamber 1 is opened in the top plate thereof, and this through hole 60 is inserted into the fitting cylindrical part 13. 13
The bottom wall 1 of the primary chamber 1 is fitted to the outer periphery of the
It is integrally fixed to the lower surface of the container a, and a flange portion 61 is formed on the periphery of the lower opening side. Further, the spring case 6 has an opening 62 opened to the outside formed in its peripheral wall as a connecting pipe for connecting a discharge pipe.

The secondary chamber 2 has a mounting flange 21 formed on the periphery of the upper surface on the opening side, which corresponds to the flange 61 formed on the periphery of the spring case 6. By overlapping the flange 61 and closing them with the set bolts 20, they are integrally fixed to the lower surface of the spring case 6. When closing, the peripheral edge of the pressure sensitive plate 5 is sandwiched between them. By placing the pressure sensitive plate 5 in place, the pressure sensitive plate 5 is assembled to cover the opening on the upper surface side of the secondary chamber 2.

The pressure sensitive plate 5 has a relief valve opening 70 with a diameter larger than the outer diameter of the cylindrical valve 4 at its axial center, and a secondary side of the rim of the valve opening 70. A valve seat 71 for a relief valve is formed in an annular shape on the chamber 2 side.
The proximal end of the cylindrical valve 4 passes through the valve port 70 and enters the secondary chamber 2, and there is a relief valve valve 7 facing the relief valve valve seat 71.
2 is attached in the form of a lid plate that covers the aforementioned valve port 70 from the secondary chamber 2 side. Further, a spring F2 is provided between the pressure sensitive plate 5 and the cylindrical valve 4 to push down the pressure sensitive plate 5 downward with respect to the cylindrical valve 4. Valve seat 7 for valve
1 is brought into pressure contact with the relief valve valve 72 installed at the base end of the cylindrical valve 4, so that the pressure sensitive plate 5 can be moved into and out of the base end of the cylindrical valve 4. It is designed to be connected to. And this spring F
2 is set to a spring pressure stronger than the spring pressure of the spring F1 stretched between the pressure sensitive plate 5 and the inner surface of the top plate of the spring case 6 so that the pressure sensitive plate 5 faces the pressure on the secondary chamber 2 side. There is.

In the illustrated embodiment, 22 is an outlet formed in the secondary chamber 2 and is formed in a connecting pipe. Further, 40 is a pressure reducing valve opening opened at the tip of the cylindrical valve 4, 41 is a pressure reducing valve formed at the tip 4a of the cylindrical valve 4, and 42 is installed on the outer surface of the body peripheral wall of the cylindrical valve 4. This is a spring receiver that supports one end side of the above-mentioned spring F1. In addition, in the case where the pressure reduction/relief valve A is attached to the boiler body, the secondary chamber 2 is removed from the flange 61 of the spring case 6 and the flange 61 of the spring case 6 is removed. By attaching it directly to a connection port provided in the peripheral wall of the boiler body, the boiler body may be configured to serve as a secondary chamber.

The embodiment device constructed in this manner operates as follows.

When the pressure P2 on the secondary chamber 2 side is zero, the pressure sensitive plate 5
Then, the cylindrical valve 4 is pushed down by the spring F1 and enters the state shown in FIG.

In this state, fluid at a pressure P1 is supplied from the inlet 10 and flows from the primary chamber 1 through the cylindrical valve 4 into the secondary chamber 2, and as a result, the pressure inside the secondary chamber 2 becomes P2. , the force pushing up the pressure sensitive plate 5 is the product of the pressure receiving area S1 of the pressure sensitive plate 5 and the pressure P2 in the secondary chamber 2, that is, S1×P2.

Therefore, in the case of S1×P2>F1, where S1×P2 is larger than the spring pressure set for spring F1, the pressure sensitive plate 5 is pushed up and the cylindrical valve 4 is moved so that S1×P2=F1. The pressure reducing valve seat 3 moves in the closing direction.
The pressure reducing valve port 40 formed between the pressure reducing valve 41 and the pressure reducing valve 41 is narrowed to reduce the pressure of the fluid flowing into the secondary chamber 2 side, and conversely, S1×P2< In the case of F1, the pressure sensitive plate 5 is pushed up by the spring F1, and the cylindrical valve 4 moves in the direction in which the pressure reducing valve 41 widens the opening degree of the valve port 40. In addition, when the pressure P2 on the secondary chamber 2 side reaches the set pressure, the pressure reducing valve 41
contacts the pressure reducing valve seat 3 and closes the valve port 40,
Prevent the pressure P2 on the secondary chamber 2 side from rising any further. During the pressure reducing operation of this cylindrical valve 4, the cylindrical valve 4
The spring F2 stretched between the cylindrical valve 4 and the pressure sensitive plate 5 does not extend or contract because the cylindrical valve 4 and the pressure sensitive plate 5 move together.

Next, due to an abnormality on the secondary side, the pressure P on the secondary chamber 2 side
2 becomes abnormally high, first, the pressure sensitive plate 5 and the cylindrical valve 4 move upward, and the tip of the cylindrical valve 4 comes into contact with the valve seat 3 for the pressure reducing valve, and then,
A valve port 70 for a relief valve is connected from the pressure receiving area S1 of the pressure sensitive plate 5.
When the product of the pressure receiving area S1-S2 when the relief valve is activated, which is obtained by subtracting the opening area S2 of , and the pressure P2 of the secondary chamber 2 becomes larger than the sum of the spring pressures of the spring F1 and the spring F2, that is, ( S1−S2) When P2>F1+F2, the relief valve seat 71 provided on the pressure sensitive plate 5 is moved from the relief valve provided at the base end of the cylindrical valve 4, as shown in FIG. The valve 70 for the relief valve is opened, and the fluid on the secondary side is released to the atmosphere through the opening 62 provided in the spring case 6 through the inside of the spring case 6, and the pressure on the secondary side is released. The pressure will be maintained within the set pressure.

As explained above, in the cylindrical valve type pressure reducing/relief valve according to the present invention, the tip is attached to the proximal end of the pressure reducing cylindrical valve that freely faces the pressure reducing valve seat provided on the primary chamber side. , in a cylindrical valve type pressure reducing valve which is made by connecting pressure sensitive plates that operate by sensing the pressure on the secondary chamber side,
A connection part between the base end of the cylindrical valve and the pressure sensitive plate is freely releasable and detachable, and a relief valve is provided at the base end of the cylindrical valve, and the relief valve is opposed to the relief valve. A valve opening for the relief valve is formed on the pressure sensitive plate, and a valve seat formed around the valve opening for the relief valve is pressed into contact with the relief valve between the pressure sensitive plate and the cylindrical valve. A spring that biases the pressure sensitive plate is stretched, and the spring pressure of the spring is set to be stronger than the spring pressure of the spring provided so that the pressure sensitive plate faces the pressure on the secondary chamber side. The relief valve provided at the base end of the cylindrical valve and the relief valve seat provided on the pressure sensitive plate are connected to each other. The connecting portion between the cylindrical valve and the pressure-sensitive plate, which are joined together so that they can be freely separated and separated, is connected as one body during the pressure reduction operation by a spring provided between the cylindrical valve and the pressure-sensitive plate. The connection is released only when the pressure on the downstream side becomes abnormally high, opening the relief valve opening. The valve can be incorporated in such a way that when an abnormal pressure occurs on the secondary side, the pressure is released and maintained within a predetermined set pressure, while ensuring that the pressure reducing valve performs its predetermined function accurately.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a cylindrical valve type pressure reduction/relief valve in which the present invention can be implemented, Fig. 2 is an explanatory diagram of the operation when the same pressure reduction is activated, and Fig. 3 is when the same as the above is operated as a relief valve. FIG. Explanation of drawing symbols, A... Pressure reduction/relief valve, a...
Valve box, 1... Primary chamber, 1a... Bottom wall, 10... Fluid inlet, 11... Connecting pipe section, 12... Cylinder section for assembly, 13... Fitting tube section, 2... Secondary room, 20...
...Set screw, 21...Mounting collar, 22...Outlet, 3...Valve seat, 4...Cylindrical valve, 4a...Tip,
40...Valve port, 41...Valve, 42...Spring receiver,
5... Pressure sensitive plate, 6... Spring case, 60... Through hole, 61... Flange, 62... Opening port, 7... Pressure adjustment screw, 70... Valve port, 71... Valve seat, 72...
...Valve, F1, F2...Spring.

Claims (1)

[Claims] 1. A pressure-sensitive plate that senses the pressure on the secondary chamber side and operates is connected to the base end of the pressure-reducing cylindrical valve whose tip is movably facing the pressure-reducing valve seat provided on the primary chamber side. In the cylindrical valve type pressure reducing valve, the connecting portion between the base end of the cylindrical valve and the pressure-sensitive plate is freely releasable and detachable, and a relief valve is provided at the base end of the cylindrical valve.
A relief valve opening facing the relief valve is formed in the pressure sensitive plate, and between the pressure sensitive plate and the cylindrical valve,
A spring that biases the valve seat formed around the relief valve opening into pressure contact with the relief valve is stretched, and the spring pressure of the spring is applied to the pressure sensitive plate on the secondary chamber side. A cylindrical valve type pressure reduction/relief device, which is set to be stronger than the spring pressure of a spring provided to face the pressure, and is equipped with an opening on the outside surface of the pressure sensitive plate to communicate the valve port for the relief valve to the outside. valve.