Impulse Safety Valve

Model
GA49H/F2/A69Y

Impulse safety valve brief figure of structure

Impulse safety valve chief property and specification

Working temperature	≤420℃
Suitable medium	Air, gas etc.

Inner assemble safety valve dimensions (mm)

NominalDiameter DN(mm)	Dimension
	D	D1	D2	D3	z-￠d	H1	H2	L	L1	L0
25	115	85	65	58	4-14	90	125	100	100	670

Impulse safety valve usageTop of page

This valve is used for power plant boilers, pressure containers, pressure and temperature reducing device and other facilities. It serves to prevent the pressure exceeding the highest allowable pres-sure value and ensure the safety of the device when working.

Impulse safety valve structure briefingTop of page

1,The pressure of the disc is balanced through the lever and heavy hammer and the valve is ensured seal by moving the for ton of heavy hammer and changing the weight of heavy hammer to reach the required set pressure.
2,The sealed surface is made of Fe base stainless steel by overlaying welding. Through thermal treatment, the wear resistance and anti-erosion of disc is improved.
3,At the top of valve is equipped an electromagnet to open and another to close the valve. The actions of the mechanism and the electric appliance are separate and will not affect each other.

Impulse safety valve installation instructionTop of page

1,This valve shall be used with main safety valve A49H-4 to-gather.
2,Impulse safety valve shall be installed vertically and the lever shall be kept level. The clearance from the lever to both sides of guide fork shall be even.
3,The pipeline shall be washed clean before installing impulse safety valve.
4,A long distance between the leading pipe of the impulse safety valve and the inlet pipe of the main safety valve shall be kept. And the distance between the electric contact pressure meter and the inlet pipe of the main safety valve shall be no less than 5 times of the diameter of the inlet pipe, for feat that the validity of the mater and the impulse safety valve may be affected by the steam releasing process of the main safety valve.

Main safety valve usageTop of page

This valve is used for power plant boilers, pressure containers, pressure and temperature reducing device and other facilities. It serves to present the pressure exceeding the highest allowable pres-sure value and ensure the safety of the device when working.

Main safety valve structure briefingTop of page

1,When the medium pressure rises to the set pressure, the in-pulse safety valve opens, and the medium in the impulse pipe enters into the piston chamber of the main safety valve from impulse pipe, forcing the piston to descend, and then the valve automatically open-s; when the impulse safety valve closes, the disc will slash automatically close.
2,The sealed surface is made of Fe base stainless steel by over-laying welding. Through thermal treatment, the wear resistance and anti-erosion of disc so improved.

Main safety valve installation instructionTop of page

1,The main safety valve shall be installed vertically at the highest. position of the device.
2,The main safety valve shall be fastened upon the gallows, which sustains the back-seat force produced in the steam discharging process of the main safety valve.
3,The exhaust pipe shall contain a special gallows to prevent the force of its weight directly applying on the main safety valve. The connecting Lange At the lowest point of the exhaust pipe, water drainage shall be taken into consideration to avoid producing water hammer while discharging set between the main safety valve and exhaust pipe shall eliminate any extra stress.
4,At the lowest point of the exhaust pipe, water drainage shall be taken into consideration to avoid producing water hammer while discharging steam.

Main safety valve main external and connecting dimensionsTop of page

Type	Nominal Diameter	Connecting dimensions
		L	L1	L2	H	D	D1	D2	b	z-d	DN´	D´	D1´	D2´	b´	Z´-d´
A49H-40	150	220	230	240	486	300	250	204	30	8-25	200	360	310	278	34	12-25
A49H-40	200	270	295	330	615	375	320	260	38	12-30	300	485	430	390	40	16-30
A49H-40	250	300	350	370	646	445	385	313	42	12-34	350	550	490	450	44	16-34

Impulse safety valve usageTop of page

GA49H-16C style DN40/50 impulse safety valve also can call lever safety valve, mainly used in the power-station boiler and steam pressure pipeline. This valve can be used singly or assorted using. When the pressure of the medium in the pressure container beyond the upper limit, the disc will be opened and put out the exceeding pressure steam, when the pressure reduced down to lower limit, the heavy hammer of the lever will strike the disc and make it closed, that can assure the normal using and safety using of the machine.

Impulse safety valve configuration brief introduction:Top of page

1, Impulse safety valve is mainly constitute of body,
dies seat, lever, hammer, the sketch is as follows:
2,Property range
Nominal pressure: 1.6Mpa
Nominal diameter: 40/50mm
Shell strength: 2.4Mpa
Lift:: ≥9mm
Working temperature:≤350℃
Applicable medium: Steam, Oil
Materials for main parts

Main safety valve usageTop of page

F2-250/400 main safety valve is assorted with the impulse safety valve GA49H-16C DN40/50. They are in the pipeline for steam turbine in power station. When the pressure inside the pipeline is higher than the allowed value, the impulse safety valve will open at first, and than the main safety valve will open; when the pressure decrease to the security value, the impulse valve close, and then the main safety valve close at the same time, to protect the pipeline and steam turbine.
The working temperature is 425℃ or less.

Main safety valve usageTop of page

This device is used for power plant boilers with steam conditions as: P=10Mpa; t=540℃. Its main function is to avoid the medium pressure inside the boiler exceeding the allowable value to ensure that the boiler run safely.

Main safety valve structure briefing & installation instructionTop of page

1,The structure of the valve is of double exhaust and both of its ends are connected with flange. It is mainly consisted of body, connecting pipe, cushion container, piston chamber, disc, valve stem and other parts.
2,When the medium pressure rises to the set pressure, the impulse safety valve opens, and the medium in the impulse pipe tars into the piston chamber of the main safety valve from impulse pipe, forcing the piston to descend, and then the valve automatically opens; When the impulse safety valve closes, the disc will also automatically close. 3, The sealed surface is made of hard alloy of cobalt by overlaying welding. Through thermal treatment, the hardness of disc is improved.
4, The main safety valve shall be installed vertically at the highest position of the equipment.
5, The main safety valve shall be fastened upon the support, which sustains the counterforce produced in the steam discharging process of the main safety valve.
6, The exhaust pipe shall contain a special gallows to prevent the force of its weight directly applying on the main safety valve. The con-nesting Lange between the main safety valve and exhaust pipe shall eliminate any extra stress.
7, At the lowest point of the exhaust pipe, water drainage shall be taken into consideration to avoid producing water hammer while discharging steam.

Main safety valve main external and connecting dimensionsTop of page

Type	Nominal Diameter	Connecting dimensions
		L	L1	H	D	D1	DN´	D´	D1´	D2´´´	b´	z-⊄d
A69Y-P455.3V	150	560	638	698	220	165	150	300	250	204	30	8-25
A69Y-P466.7V	150	560	638	698	220	165	150	300	250	204	30	8-28
A69Y-P5410V	150	560	638	698	220	165	150	300	250	204	30	8-25
A69Y-P5410.5V	150	560	638	698	220	165	150	300	250	204	30	8-25

Impulse safety valve usageTop of page

This valve is used for power plant boilers, pressure containers, pressure and temperature reducing device and other facilities. It serves to prevent the pressure exceeding the highest allowable pres-sure value and ensure the safety of the device when working.

Impulse safety valve structure briefingTop of page

1,The pressure of disc is balanced through the lever and heavy hammer and the valve is ensured seal by moving the position of heavy hammer and changing the weight of heavy hammer to reach the required set pressure.
2,The sealed surface is made of Fe base stainless steel by over-laying welding. Through thermal treatment, the hardness of disc is improved.
3,At the top of valve is equipped an electromagnet to open and another to close the valve. The actions of the mechanism and the electric appliance are separate and will not affect each other.

Impulse safety valve installation instructionTop of page

1,This valve shall be used with main safety valve A69Y-Pw5410V, DN150 together.
2,Impulse safety valve shall be installed vertically and the lever shall be level. The pipeline shall be washed clean.
3,A long distance between the leading pipe of the impulse safety valve and the inlet pipe of the main safety valve shall be kept. And the distance between the electric contact pressure meter and the inlet pipe of the main safety valve shall be no less than 5 times of the diameter of the inlet pipe, for feat that the validity of the meter and the impulse safety valve may be affected by the steam releasing process of the main safety valve.
4,The valve and the electromagnets shall be placed together on a special gallows. The juncture of the valve and the electromagnet-nets shall be flexible, with no phenomenon of seizure.

Impulse safety valve main external and connecting dimensionsTop of page

Type	Nominal Diameter	Connecting dimensions
		L	L1	H	D	D1	D2	b	z-d	DN'	D'
GA49H-Pw466.7V	20	280	170	225	130	90	35	28	4-23	20	28
GA49H-Pw5410V	20	280	170	225	130	90	35	28	4-23	20	28
GA49H-Pw5410.5V	20	280	170	225	130	90	35	28	4-23	20	28

Impulse safety valve ralated productsTop of page

• Spring Loaded Low Lift Type Safety Valve
• Closed Spring Loaded Low Lift Type-High Pressure Safety Valve
• Closed Spring Loaded Full Bore Type-High Pressure Safety Valve
• Corrugated-Duct Full-Open Type Safety Valve
• Spring Full-Open Type Safety Valve Sixth A Radiator
• Air Compressor Safety Valve
• Safety Overflow Valve
• Vacuum Negative-Pressure Safety Valve
• High Temperature And High-Pressure Safety Valve
• Special Full-Lift Safety Valve For Gas
• Safety Back-Flow Valve
• Twin spring type safety valve
• Inner Assemble Safety Valve
• Impulse Safety Valve
• Single-Lever Safety Valve
• Dual-Lever Safety Valve
• Middle Temperature And Pressure Impulse Safety Device
• Pilot Operated Safety Valve
• Micro-Open Type Safety Valve
• Spring Micro-Open Type Safety Valve
• A41C Type Pound-Grade Low Lift Spring Loaded Safety Valve
• WA41C blanced bellows spring loaded safety valve
• A42C Type Pound-Grade Low Lift Spring Loaded Safety Valve
• WA42C blanced bellows spring loaded safety valve
• A44C Type Pound-Grade Full Lift Spring Loaded Safety Valve
• WA44C blanced bellows spring loaded safety valve
• A48C Type Pound-Grade Full Lift Spring Loaded Safety Valve
• A48SC Type Pound-Grade Full Lift Spring Loaded Safety Valve
• TA、A Type Special Safety Valve Series For Oil Refining
• J Series Safety Valve With Jacket
• M、R、F Series Safety Valve Screwed/Flanged
• A46C Type Pilot-Operated Pressure Relief Valve

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