JPS6312286Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a safety relief valve (hereinafter simply referred to as a safety valve) with a new structure, and particularly when installed in a pressure vessel, storage tank, etc., In the event of malfunction or other malfunction, the built-in valve plug shuts off the fluid, making it possible to open the inside of the valve, inspect, repair, or replace parts while it is installed at the site. The invention relates to a new safety valve.

The present invention also relates to a novel safety valve that can be operated on-site and tested when it is used again after a failure has been repaired or during long-term continuous operation.

[Conventional technology and problems]

The original mission of a safety valve is to prevent danger from abnormal pressure rises in pressure vessels, storage tanks, etc., and for this purpose, accurate discharge pressure and return pressure, as well as sufficient discharge capacity are required, as well as complete prevention of leakage. It must be something that can be used.

However, conventional safety valves generally receive the pressure of the internal fluid from below the valve body and the force of a spring from the upper back of the valve body via the valve stem, and open and close based on the difference in force between the two. The valve seat pressure is lower than that of ordinary valves, and there is a risk that leakage may occur even if there is slight distortion or fine dust gets caught.

Therefore, there is no problem if the safety valve is functioning normally, but if the valve is opened and closed repeatedly due to long-term use, the valve body or valve seat may become damaged due to scale in the blown gas. leakage or malfunction may occur due to the entry of even the slightest foreign matter.

As the main parts of the safety valve are thus exposed to harsh conditions, leakage accidents occur frequently, and currently, the device must be shut down and repaired or replaced each time.

In addition, process safety valves used in oil refining, petrochemical, and other equipment are completely sealed, as releasing the emitted gas directly into the atmosphere poses risks such as ignition, explosion, and generation of harmful gases. The exhaust pipe is connected to a closed blowdown system.

Recently, however, equipment has been operated continuously for long periods of time, and as a result, it is necessary to conduct periodic inspections during operation according to regulations.For this reason, block valves are inserted into the inlet and outlet of the safety valve. We are prepared for inspections, repairs, etc.

However, inserting block valves at the inlets and outlets of a large number of installed safety valves is disadvantageous as there is a risk that the block valves themselves may malfunction.
It also poses a heavy economic burden.

[Purpose of invention]

The present invention was developed in consideration of these circumstances, and even if a failure such as leakage or malfunction occurs in the safety valve, the device does not have to stop operating, and is built into the safety valve itself. The aim is to provide a new safety valve that shuts off fluid using a valve stopper, making it possible to open the inside, inspect, adjust, replace parts, and even test the operation of the valve while it is installed at the site. .

An example of a device that merely achieves this purpose is described in Japanese Utility Model Publication No. 32-5567.

The present invention makes it possible to easily test such known valve plugs by supplying inert gas inside them when repairs are completed, and to easily and easily rotate the valve plug. It has been made possible to do so.

[Means for solving problems]

According to the present invention, in order to solve the above problems,
The valve body has an inlet hole and an outlet hole for pressurized fluid that are located at different positions vertically and face laterally, and has an exhaust hole on the side of the outlet hole. It has a cylindrical chamber, and has an introduction hole and a discharge hole that are located at different positions up and down and that communicate with the outer surface from the cylindrical chamber, and is properly fitted in the valve box so as to be rotatable around a vertical axis. In the rotational position, the introduction hole and the discharge hole communicate with the inlet hole and the outlet hole, respectively, in the valve body, and in another rotational position, the introduction hole and the inlet hole and the discharge hole and the While cutting off communication with the outlet hole, the discharge hole and the exhaust hole are communicated with each other through the cylinder chamber, and further projects downward from the center and has a screw thread on the outer surface of the lower end. A valve plug including a cylindrical shaft that is cut and has an inert gas supply hole that communicates with the cylindrical chamber from the lower end, and an upper end of a vertical passage hole that is a communication portion between the introduction hole and the discharge hole in the valve plug. a valve seat provided on the valve seat; a valve body that is in contact with the valve seat and is integral with the valve stem; and a valve body that is fitted onto the valve stem and presses the valve body downward;
A compression spring that compresses the valve seat; a spring box that is fixed to the valve box and houses the spring; and a spring box that is pivotally connected to the spring box and rotates about a horizontal axis to apply pressure to a portion of the valve stem. Lock this,
a lever that can be raised against the spring to separate the valve body from the valve seat; and a rotatable but immovable sleeve that is threaded onto the male thread of the cylindrical shaft of the valve stopper. A safety relief valve is provided, comprising: a handle for lifting and lowering a valve stopper that is integral with a sleeve; and an opening/closing handle that is integrated with the valve stopper.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings. It goes without saying that this safety valve is provided in a bypass section for introducing pressure fluid in a pipeline or the like.

Reference numeral 1 denotes a cylindrical valve box whose diameter gradually becomes smaller toward the top, with an inlet hole 2 on one side of the lower part, an inlet/outlet hole 3 on the other side of the upper part, and a hole facing the side facing the outlet hole 3. It is equipped with an exhaust hole 4.

A frustoconical valve stopper 5 is properly fitted in the valve housing 1 so as to be rotatable.

The valve plug 5 is provided with a large-diameter vertical straight cylindrical chamber 6 extending from its upper surface to the middle part, and the lower end of the cylindrical chamber 6 is connected to one side of the lower part of the valve plug 5 through a vertical through hole 6a. It is communicated with an introduction hole 7 which is open to.

Above the introduction hole 7, on the side of the cylinder chamber 6,
A lateral discharge hole 8 is bored through the outer surface of the valve stopper 5 .

As shown in FIG. 1, each of these holes 7 and 8 communicates with an inlet hole 2 on one side of the valve body 1 and an outlet hole 3 on the other side, respectively.
As shown in the figure, when the valve plug 5 is rotated by 180 degrees, the introduction hole 7 and the inlet hole 2, as well as the discharge hole 8 and the outlet hole 3 are shut off, and the discharge hole 8 is brought into communication with the exhaust hole 4. ing.

A cylindrical valve seat 9 is fitted into the upper end of the through hole 6a, and a valve body 11 integral with a valve rod 10 is seated on the upper end surface of the valve seat 9.

A closing plate 13 and an outward flange 12a at the upper end of the guide tube 12 are fitted and fixed to the upper opening of the valve box 1 in a vertically overlapping manner.

The guide cylinder 12 hangs down into the cylinder chamber 6, and the valve body 1
1 is guided by a guide tube 12.

The valve rod 10 passes through the guide cylinder 12 and the closing plate 13 and extends upward.

Spring receiver 14 fixed to the middle part of the valve stem 10
is in contact with the upper surface of the closing plate 13.

A spring box 15 is fixed to the top surface of the valve box 1 with bolts 16, and the lower end of a compression spring 17, which is fitted onto the valve stem 10 and housed in the spring box 15, is attached to the top surface of the spring receiver 14. It is oppressing.

The upper end of the compression spring 17 is brought into contact with a vertically adjustable spring seat disposed on the upper part of the spring box 15,
A receiving plate 18 is fixed to the upper end of the valve stem 10.

The base end is attached to the horizontal pin 1 on one side of the upper end of the spring box 15.
The upward projection 21 of the horizontal lever 20, which is pivoted at 9, is in contact with the lower surface of the receiving plate 18.

The horizontal portion of the Γ-shaped handle 23 whose upper end is pivotally supported on the other side of the upper end of the spring box 15 with a horizontal pin 22 is in contact with the lower surface of the free end of the horizontal lever 20, and the Γ-shaped When the handle 23 is rotated upward, the horizontal lever 20 is also rotated upward, lifting the valve stem 10 via the receiving plate 18.

A cover plate 25 is attached to the lower surface of the valve box 1 via a gasket 24 with bolts 26, and the valve plug 5
The cylindrical shaft 27 that protrudes downward from the center of the lid plate 25
extends downwardly through the central hole of. Cylindrical shaft 27
, there is a gas supply hole 2 extending from its lower end to the introduction hole 7.
8 is drilled.

A cover tube 29 is fixed to the lower surface of the cover plate 25, and a female screw hole 31 in a rotatable but non-vertically movable sleeve 30 is fitted into the lower part of the cover tube 29 from above.
is screwed into a male thread 32 carved in the lower end of the cylindrical shaft 27.

A handle 33 for lifting and lowering the valve plug 5 and a handle 34 for opening and closing the valve plug 5 are fixed to the lower ends of the sleeve 30 and the cylinder shaft 27, respectively.

An internal pressure extraction hole 35 and an exhaust valve attachment port 36 following the internal pressure extraction hole 35 are provided at appropriate locations in the spring box 15.

In addition, 37 is a cover of the exhaust hole 4 fixed to the valve box 1 by bolts 38, 39 and 40 are sealing rings, and 41 is a nipple.

According to the safety valve of the present invention having such a structure, when a failure such as leakage occurs due to foreign matter getting between the valve body 11 and the valve seat 9 in the flow state shown in the first figure, is the opening/closing handle 34 as shown in Figure 2.
By rotating the valve stopper 5 by 180° with
After closing the inlet hole 2 and outlet hole 3, the Γ-shaped handle 2
3 to lift the valve stem 10 and valve body 11 and lower the pressure inside the cylinder chamber 6, and then,
By unscrewing the bolts 16 and removing the spring box 15, the cover plate 13, the guide tube 12, etc., each component in the tube chamber 6 can be inspected, repaired, replaced, etc. easily.

After the failure is repaired, the guide tube 12, closing plate 13, spring box 15, and others are attached, and the opening/closing handle 34 is rotated 180 degrees in the opposite direction, so that the device can be put into use.

In the present invention, by moving the valve stopper 5 slightly downward using the lifting handle 33,
The valve stopper 5 can be rotated easily and lightly.

In addition, when the safety valve repair is completed, or
To test the operation of the safety valve during operation, remove the cover 3 of the exhaust port 4 with the fluid shut off.
7 and remove the nipple 41 and gas supply hole 28.
It is possible to test by introducing an inert gas, such as Tituso, through the system, and it can be adjusted to operate at the normal pressure.

Note that the internal pressure release hole 35 is for lowering the pressure inside the spring box 15 that has risen due to some reason.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal sectional front view of an embodiment of the safety valve of the present invention showing the valve plug in the open state, and FIG. 2 is a longitudinal sectional view of the valve plug portion showing the valve plug in the closed state. be. 1...Valve box, 2...Inlet hole, 3...Outlet hole, 4
...Exhaust hole, 5...Valve stopper, 6...Cylinder chamber, 6a...
Through hole, 7...Introduction hole, 8...Discharge hole, 9...Valve seat, 10...Valve stem, 11...Valve body, 12...Guide cylinder, 12a...Outward flange, 13...Closing plate ,
14... Spring receiver, 15... Spring box, 16... Bolt, 17... Compression spring, 18... Backing plate, 19...
...Horizontal pin, 20...Horizontal lever, 21...Upward projection, 22...Horizontal pin, 23...Γ-shaped handle, 24...Putskin, 25...Lid plate, 26...
Bolt, 27...Cylinder shaft, 28...Inert gas supply hole, 29...Cover tube, 30...Sleeve, 31...
Female screw hole, 32...Male thread, 33...Elevating handle, 34...Opening/closing handle, 35...Internal pressure release hole, 36...Exhaust valve mounting port, 37...Cover,
38...Bolt, 39,40...Seal ring,
41...Nitspur.

Claims (1)

[Claims for Utility Model Registration] A valve body 1 comprising a pressure fluid inlet hole 2 and an outlet hole 3 that are vertically different in position and facing sideways, and an exhaust hole 4 on the side of the outlet hole 3; The valve body 1 has a truncated conical shape, and is provided with a cylinder chamber 6 extending vertically therein, as well as an introduction hole 7 and a discharge hole 8 that are vertically positioned at different positions and communicate with the outer surface from the cylinder chamber 6. The inlet hole 7 and the outlet hole 8 are connected to the inlet hole 2 and the outlet hole 3 in the valve body 1, respectively, in a certain rotational position. At the same time, at another rotational position, the introduction hole 7 and the inlet hole 2 and the discharge hole 8 and the outlet hole 3 are disconnected from each other, and the discharge hole 8 is opened through the cylinder chamber 6.
Further, an inert gas supply hole 28 projects downward from the center, has a thread 32 cut on the outer surface of its lower end, and communicates with the cylinder chamber 6 from its lower end. a valve seat 9 provided at the upper end of a vertical through hole 6a that is a communication portion between the introduction hole 7 and the discharge hole 8 in the valve plug 5; A valve body 11 that is in contact with the seat 9 and is integral with the valve stem 10; A compression spring 17 that is fitted onto the valve stem 10 and presses the valve body 11 downward and against the valve seat 9. , a spring box 15 fixed to the valve box 1 and housing the spring 17; hand,
This is screwed into a lever 20 that can be raised against the spring 17 to separate the valve body 11 from the valve seat 9, and a male thread 32 of the cylindrical shaft 27 of the valve stopper 5. A safety relief valve comprising: a sleeve 30 that is rotatable but not movable up and down; a handle 33 for lifting and lowering a valve plug 5 integral with the sleeve 30; and an opening/closing handle 34 integral with the valve plug 5.