JPS62192813A - Reducing/bypass valve - Google Patents

Abstract

PURPOSE:To bypass abnormal pressure speedily by forming a reducing value while maintaining its mechanism and function as they are, and incorporating a bypass valve which vents the abnormal pressure speedily when the abnormal pressure is produced at the secondary side. CONSTITUTION:The pressure reducing/bypass valve V is formed by coupling the reducing valve 20 which performs opening/closing control over a communication between the primary side X and secondary side Y with a pressure sending plate 5 which operates by sending secondary pressure, and holding the secondary-side pressure at set pressure and also venting abnormal pressure through the bypass valve 6. Such a reducing valve 20 is coupled with the pressure sending plate 5 through a valve rod 3 equipped with a piston 30, a rod 4 penetrates the axis of the valve rod 3 vertically in a slidable state, and the bypass valve 50 is coupled with the rod 4. A spring 70 which pushes out the rod 4 toward a position control stopper S is coupled with the bypass valve 60 and a valve opening 61 for the bypass valve is provided to the bottom part of a valve box 1. Consequently, abnormal pressure is bypassed without making the mechanism complex.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a pressure-reducing valve that controls opening and closing of communication between the negative side and the secondary side, which is connected to a pressure-sensitive plate that operates by sensing secondary pressure.
This invention relates to a pressure reducing/relief valve configured to maintain the pressure on the secondary side within a set pressure, and a relief valve that releases pressure due to an abnormal increase in pressure on the secondary side.

A pressure reducing valve is usually used in combination with a relief valve, but in the past, the pressure reducing valve and the relief valve were manufactured separately, and when used, they were combined and used separately. In order to avoid the hassle of this installation work, we have installed a pressure reducing valve with a relief valve integrated into the pressure reducing valve.
There is a request for a relief valve. However, it requires a complicated mechanism to incorporate a relief valve mechanism that releases abnormal pressure on the secondary side so that the pressure reducing valve can perform the specified pressure reducing operation correctly.
In particular, there are many difficulties with relief valves used in boilers, which are required to quickly and safely release abnormal pressure generated in the secondary side of the can, and none have been put to practical use.

The present invention has been made to solve these problems, and by effectively utilizing the mechanism of the pressure reducing valve, the mechanism can be prevented from becoming complicated, and abnormal pressure on the secondary side can be prevented. The purpose of the present invention is to provide a pressure reducing/relief valve incorporating a relief valve so that the pressure can be quickly released to the outside.

For this purpose, in the present invention, a pressure reducing valve that controls opening and closing of communication between the primary side and the secondary side provided in the valve box has a valve rod provided with a piston on the upper end side and a piston for Herance on the lower end side. A rod that passes vertically through the shaft center of the valve stem is slidably inserted, and the upper end of the rod is connected to a pressure-sensitive plate that operates by sensing secondary pressure. A relief valve is provided at the lower end that protrudes below the pressure reducing valve.

A stopper is provided that is slidably inserted in the longitudinal direction of the rod and restricts its downward movement relative to the rod at a predetermined position, and a spring that pushes out toward the stopper is connected to the relief valve valve. A relief valve opening and closing valve, which is opened and closed by the relief valve valve, is provided at the bottom of the valve box, and the upper end side of the valve stem is brought into contact with the lower surface of the pressure-sensitive plate at a contact point. This poses a relief valve.

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

FIG. 1 is a vertically sectional front view of a pressure reducing/relief valve A in which the present invention can be implemented. A pressure reducing valve is provided to control opening and closing, 3 is a valve stem having a balance piston 30 on the upper end side and the lower end is connected to the pressure reducing valve 20, 4 is a valve stem 3 with upper and lower axial center portions of the valve stem 3. 5 is a pressure-sensitive plate that is activated by sensing secondary pressure; 6 is a pressure-sensitive plate that is activated by sensing secondary pressure;
0 is a relief valve fitted into the lower end of the rod 4 so as to be slidable in the longitudinal direction of the rod 4, and S is a relief valve that restricts the downward movable range of the relief valve 60 with respect to the rod 4. 61 is a relief valve valve port provided at the bottom of the valve box (2) so as to be opened and controlled by the relief valve valve 60; 70 is a stopper for pushing out the relief valve valve 60 toward the stopper S; It shows a spring installed like this.

The valve box l includes a valve box main body 1a having an inlet side connecting pipe 10 on the minus side and an outlet side connecting pipe 11 on the other side, and a spring case assembled in a cap shape on the upper surface of the valve box main body 1a. 1b and more. and.

A partition wall 12 is provided in the inner cavity of the valve box body 1a to separate a primary side X leading to a connecting pipe 10 on the inlet side and a secondary side Y leading to a connecting pipe 11 on the outlet side. A cylindrical part 13 with the vertical direction facing up and down is installed with its IH part communicating with the primary side The above-mentioned pressure reducing valve 20 is integrally fitted to the lower end of the valve stem 3 that protrudes downward from the lower opening of the cylindrical portion 13. It is attached. Furthermore, a pressure reducing J'P seat 21 facing the pressure reducing valve 20 is formed on the rim of the lower opening [ ] of the cylindrical portion 13 .

Further, a pressure sensitive chamber W communicating with the secondary side Y is formed on one side of the valve body main body 1a, and the pressure sensitive plate 5 is assembled so as to cover the pressure sensitive chamber W. The pressure-sensitive plate 5 is designed so that when the above-described spring case 1b is fixed to the upper surface of the valve case body 1a with a center screw, the peripheral edge of the pressure-sensitive plate 5 is inserted into the joining area between the spring case 1b and the valve body body 1a. It is assembled to valve box 1. The pressure-sensitive plate 5 is pushed into the pressure-sensitive chamber W by a pressure-reducing spring 2a stretched between an adjustment screw 80 screwed into the upper part of the spring case 1b and the top surface of the pressure-sensitive plate 5.

The rod 4 is connected to the cylindrical portion 13 described in ri7j at throat 1-2.
It is formed to be longer than the valve stem 3, and is fitted into the axial center of the valve stem 3 so as to vertically penetrate the valve stem 3 and freely slide up and down. The upper end 4a of the lot 4 that protrudes upward from the valve stem 3 is formed into a flat plate shape, abuts against the lower surface of the pressure sensitive plate 5, and faces the - side of the upper end 4a. It is integrally connected to the pressure sensitive plate 5 by making a screw 4b installed on the side protrude toward the -L side of the pressure sensitive plate 5 and tightening it with a cotton nut 7c.

Further, the lower end side of the rod 4 protrudes downward from the pressure reducing valve 20 described above, and the relief valve 60 described above is attached to the protruding portion so as to be slidable in the axial direction (longitudinal direction) of the rod 4. A stopper S, which is a retaining ring fitted and provided at the lower end of the rod 4, restricts the movable range of the rod 4 and prevents it from escaping from the rod 4. The relief valve 60 is pushed toward a position where it abuts against the stopper S by a weak spring 70 stretched between it and the lower end of the valve stem 3.

A relief valve valve 1'' 61 facing the relief valve valve 60
is formed at the bottom of the valve body body 1a at a portion located below the aforementioned cylindrical portion 13, and a connecting pipe 14 serving as a relief port is continuously installed below it. be. An annular valve seat 62 is formed on the rim of the valve port 61 and forms a relief valve 6 by abutting against the valve 60 for the relief valve.

Thus, the upper end side of the valve stem 3 protrudes into the pressure sensitive chamber W from the upper opening of the cylindrical portion 13, and the end surface 3a of the upper end thereof is formed into the flat shape of the rod 4 described above. upper end 4
By abutting against the lower surface of a, the flat upper end 4
It abuts against the lower surface of the pressure-sensitive plate 5 via a, so that it can move toward and away from the lower surface of the pressure-sensitive plate 5.

Note that the above-mentioned weak spring 70 connected to the relief valve 60
is set to an extremely weak spring pressure of ten minutes to several tens of minutes lower than the spring pressure of the pressure reducing spring 2a.

The individual packaging constructed in this way operates as follows.

The pressure on the secondary side Y side, that is, the pressure inside the pressure sensitive chamber W is for pressure reduction/
The spring pressure of the spring 2a is set to Fl, and the relief valve 60 is set to I!
! When the spring pressure of the connected spring 70 is F2, Fl-
When the value of F2 is smaller than the value of F2, the pressure sensitive plate 5
The state shown in FIG. 2 is achieved by being pushed downward by the spring pressure a.

In this state, the relief valve valve 60 is the relief valve valve seat 62.
The valve stem 3 is pushed up by the spring pressure of the spring 70 connected to the rod 4 and the pressure sensitive plate 5.
In this state, as the pressure in the pressure sensitive chamber W decreases, the pressure sensitive plate 5 and the rod 4, the valve stem 3, and the pressure-reducing valve 20 assembled thereto move together to expand and contract the opening between the pressure-reducing valve 20 and the pressure-reducing valve seat 21 to maintain a constant pressure on the secondary side Y. act to do so.

Next, when the pressure on the secondary side Y becomes larger than the value of Fl-F2, the pressure reducing valve 20 comes into pressure contact with the pressure reducing valve seat 21, resulting in the state shown in Fig. 1, and the pressure on the secondary side Y further increases. increases abnormally and becomes larger than the value of F i + F 2, the third
As shown in the figure, the pressure sensitive plate 5 and the rod 4 rise while leaving the pressure reducing valve 20 in the position where it abuts against the pressure reducing valve seat 21, thereby lifting the relief valve valve 60 and opening the relief valve 6. shall be.

Next, FIG. 4 shows another embodiment.

In this embodiment, in addition to the spring 70 that pushes up the valve stem 3, another spring 71 is provided between the lower end of the valve stem 3 and the valve body body La.
Stretch the valve JPt5 with two springs 70 and 71.
3 is pushed up.
This embodiment is the same as the embodiment shown in the figures, and the same constituent members are given the same reference numerals and detailed explanations will be omitted.

In this embodiment, when the spring pressure of the spring 71 is F3, a predetermined pressure reduction operation is performed when the pressure on the secondary side Y is smaller than the value of Fl-F2-F3, and the pressure on the secondary side Y is F3.
The relief valve 6 will open when the spring pressure becomes greater than 1+F2, but at this time, F3 is not involved, and this allows F2 to be set to an extremely small spring pressure. The valve opening operation can be sharpened.

Next, FIG. 5 shows yet another embodiment.

In this embodiment, the relief valve 60 is assembled with a manual opening/closing device a for forcibly opening the relief valve 60 by operating from the outer surface of the valve box l. Figures 1 to 3 of
This embodiment is the same as the embodiment shown in the figures, and the same constituent members are given the same reference numerals and detailed explanations will be omitted.

Therefore, the manual opening/closing bag 1 has an operating section 9 that is located below the valve port 61 at the bottom of the valve box main body 1a and protrudes from the outer surface of the valve box 1.
A push rod 9 in the shape of a button whose inner end is pushed up when pressed is provided so as to be movable up and down, and the inner end of the push rod 9 abuts against the lower surface of the relief valve 60. By pushing the push rod 9, the relief valve 60 is opened.
By pushing up against the bias of the spring 70 described above, it acts to open the valve.

In the embodiment shown in FIG. 5 as well, the spring 71 used in the embodiment shown in FIG. 4 described above may be provided, as indicated by the chain line in FIG.

As explained above, in the pressure reduction/relief valve according to the present invention, the pressure reduction valve provided in the valve box for controlling the opening and closing of communication between the primary side and the secondary side is provided with a balancing piston on the upper end side. The lower ends of the valve stems are connected, and a rod penetrating vertically through the axis of the valve stem is slidably inserted, and the -L
The end side is connected to a pressure sensitive plate that operates by sensing - secondary pressure,
A relief valve is fitted into the lower end of the rod that protrudes below the pressure reducing valve so as to be slidable in the longitudinal direction of the rod, and its downward movement with respect to the rod is controlled at a predetermined position. A stopper for regulating the relief valve is provided, a spring for pushing out toward the stopper is connected to the relief valve valve, and a relief valve opening that is opened and closed by the relief valve valve is provided at the bottom of the valve box. Since the upper end of the rod is made to freely abut against the lower surface of the pressure-sensitive plate, the mechanism and function of the pressure-reducing valve can be left as is, and the pressure-reducing valve can be prevented from experiencing abnormal pressure on the secondary side. A pressure reducing/relief valve incorporating a relief valve that quickly releases the pressure when it occurs can be incorporated by efficiently utilizing the pressure reducing valve mechanism, without complicating the mechanism. will be obtained.

[Brief explanation of drawings]

Figure 1 shows a vertical cross section TFll of a pressure reducing/relief valve that can implement the present invention.
Fig. IIi, Fig. 2, and Fig. 3 are explanatory diagrams of the same operation, Fig. 4 is a longitudinal sectional front view of another embodiment, and Fig. 5 is a longitudinal sectional front view of a further different embodiment. Explanation of drawing symbols A...Pressure reduction/relief valve a...Manual opening/closing device S.
...Stopper W...Pressure sensitive chamber X...-Next side
Y... Secondary side F1/F2-F3... Spring pressure
1...Valve box 1a...Valve box body 1b...
Spring cases 10, 11... Connection pipe 12... Partition wall 13... Cylindrical part 14... Connection pipe 20... Valve for pressure reduction 2a... Spring for pressure reduction 21... Valve seat for pressure reduction 3 ...Valve stem 3a...End face 30...
・Piston 4...Rod 4a...End
4b...screw 4C...cotton net 5...
Pressure sensitive plate 6...Relief valve 60...Valve for relief valve 61...Valve port for relief valve 62...Annular valve seat 7
0-71...Spring 80...Adjustment screw 9...
Push rod 90...Operation unit Patent application Human Nutcy Co., Ltd. District 1, Figure 2, Figure 3! ! ! Figure 4 No' Figure 5 Button

Claims (1)

[Claims] The lower end of a valve stem with a balance piston on the upper end is connected to a pressure reducing valve provided in the valve box that controls opening and closing of communication between the primary side and the secondary side, and the axis of the valve stem is A rod that penetrates vertically into the part is slidably inserted, the upper end of the rod is connected to a pressure sensitive plate that is activated by sensing secondary pressure, and the lower end of the rod projects downward from the pressure reducing valve. In the department,
A relief valve is slidably inserted in the longitudinal direction of the rod, and a stopper is provided to restrict downward movement of the relief valve to a predetermined position with respect to the rod, and the stopper is attached to the relief valve. A relief valve opening is provided at the bottom of the valve box, and the relief valve opening is opened and closed by the relief valve valve. A pressure reducing/relief valve made of a butt-closed valve.