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Yongjia Goole Valve Co., Ltd.
Yongjia Goole Valve Co., Ltd.
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Superhigh Pressure Impulse Safety Device (H series)

Superhigh Pressure Impulse Safety Device (H series)

Brand Name : goole
Model Number : GA49Y-PW5414V
Place of Origin : China
MOQ : 10
Price : 105
Payment Terms : T/T, L/C, Western Union
Supply Ability : 10000
Delivery Time : 15-45
Packaging Details : plywood case
Certification : CE
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Superhigh pressure impulse safety device Instruction
This suiperhigh pressure impulse safety device is used for power plant boilers with steam working conditions as: P=13.72MPa, T=540 C. Its main function is to avoid the medium pressure inside the boiler exceeding the allowable value to ensure that the boiler run safely.

Superhigh pressure impulse safety device features:
The impulse safety device is the main safety valve, with auxiliary valve support contained. This device has large discharge ability with convenient adjustment.

Superhigh pressure impulse safety device working principle:
When the medium pressure inside the boiler surpasses the allowable value, the impulse safety valve opens firstly; the steam enters into the piston chamber of the main safety valve, forcing the main safety valve to open; the boiler bengins discharging steam; after the excess pressure has been released, the impulse safety valve closed, stopping the steam entering into the piston chamber of the main safety valve; the main safety valve automatically closes at the reactions of the springs and medium.

Superhigh Pressure Impulse Safety Device (H series)

Description of Impulse Safety Device

1. Use
The impulse safety device is used for power station boilers or

pressure vessels to prevent the medium pressure from exceeding the

allowable value to ensure their safety valve.

2.Characteristics
The impulse safety device works with an impulse safety valve and a main

safety valve. This device has a large discharge ability with convenient

adjustment, double mechanical and electrical protection and user-

friendly installation and maintenance.

3. Operation Principle
When the medium pressure is lower than the setting pressure, the

impulse safety valve will be enclosed under the spring force, while the

main safety valve will be enclosed under the medium pressure; when the

medium pressure is higher than the setting pressure, the impulse safety

valve will open and steam will enter into the main safety valve's

piston chamber to open the main safety valve and discharge steam to the

outside; when the pressure drops to the reseating value, the impulse

safety valve will be closed to cut off steam going into the safety

valve's piston chamber, and the main safety valve will be closed

automatically as acted by spring and the medium.

4. Structure
1. The impulse safety device is as shown in the figure, mainly

consisting of impulse safety valve, main safety valve, stop valve and

throttle valve.

2. The impulse safety valve is a kind of sping or heavy hammer lever.

The safety device's opening pressure can be adjusted by adjusting the

spring compression or the heavy hammer position on the lever. Also the

impulse safety valve contains an electromagnet to open or close the

valve, with no interference between mechanical and electrical actions.

3. The main safety valve is as shown in the figure. Its steam exhaust

end adopt a flange connection form, and it mainly consists of body,

cushion valve, piston chamber, disc and other parts. The valve adopts

the pressure self tightening and sealed structure. The higher the

medium pressure is, the better the sealability will be. The cushion

valve serves as a buffer in the working process of the main safety

valve to avoid the damage of the sealed surface and the disc.

4. The upper part of the impulse safety valve contains an

electromagnet to open or close. At ordinary times, the close-off

electromagnet may not be electrified, but when the sealed surface of

the valve leaks, it can be electrified continuously to make the valve

sealed; or when the mechanical adjusting reseating pressure is

excessively low, it can be electrified to help the disc return and

procure a higher reseating pressure.

5. Installation Instruction
1. The main safety valve and the impulse safety valve should be

installed together. The distance between the outlet pipe of the impulse

safety valve and the inlet pipe of the main safety valve should be

maintained as relatively long and the distance between the electric

contact pressure meter and the inlet pipe of the main safety valve

should be no less than 5 times of the diameter of the inlet pipe, of

the main safety valve should be no less than 5 times of the

diameter of the inlet pipe for fear t hat the precision of the

meter and the impulse safety valve may be affected by the

steam discharging process of the main safety valve.
2. Before the installation of the main safety valve, the pipeline

shall be cleaned first.

3. The main safety valve and the impulse safety valve must be

positioned vertically. After the installation and the welding of main

safety valve, it shall be under partial heat treatment.

4. The main safety valve shall be fastened upon the framework, which

sustains the counter-reaction force produced in the steam discharging

process of the mains safety valve. The exhaust pipe of the mains safety

valve shall be supported with a special gallow lest the force of its

weight and action would be directly apply to both the main safety valve

and the flange that is connecting them. At the lowest point of the

exhaust pipe, water drainage shall be taken into consideration to avoid

producing water hammer when the main safety valve is discharging steam.

The three loops of filling above the mains safety valve's piston

chamber shall be deeply compressed until the lower surface of the

filling gland touches the upper surface of the piston, and a fine wire

shall be used to fasten the pressure bolt to avoid leakage and refusing

release of the main safety valve.

5. The impulse safety valve and the electromagnets shall be placed

together on a special gallow. The juncture of the upper lever of the

valve and the electromagnets shall be flexible, with no phenomenon of

seizure. The impulse safety valve shall be installed in a place with

little dust, dry air and convenient maintenance and debugging and where

no vibration occurs. Its ambient temperature shall not be higher than

70 Deg C, and its relative humidity not more than 80%.

6. To ensure the agile working of the impulse safety valve, the

distance between the circular arc part of the head of the seat

returning lever and the end of the pressure bar of the valve shall be

adjusted to such a length as the actual travel of the valve plus 1mm

(adjusted by the M10 fastening screw at the top of the cap.)


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