Gaa49h Steam Turbin Main Safety Valve

• Customization: Available
• Pressure: Pn40
• Structure: Used Together with Ga49h-16 Impulse Safety Valve
• Model NO.: GAA49H
• Material: Wcb
• Category: Safety Valve
• Size: Dn150-250
• Connecting Type: Flanged Inlet& Outlet
• Medium: Steam, Air
• Medium Temperature: Below 425 Deg C
• Usage: Overpressure Protection Device
• Application: Power Plant Steam Turbine Pipelines
• Transport Package: Plywood Case
• Specification: CE, SGS, TUV
• Trademark: GOOLE, OEM
• Origin: Wenzhou, Zhejiang, China
• HS Code: 8481400000
• Production Capacity: 10000PCS/Year

Product Description

GAA49H Steam Turbin Main Safety Valve

Product Description

A49H main safety valve is mainly used on pressure vessels, power plant boilers, and temperature and pressure reducing devices to prevent pressure from exceeding the allowable maximum pressure value and ensure the safe operation of equipment.

Application

Use:
This valve is used for power plant boilers, pressure containes, pressure and temperature reducing devices and other facilities. It serves to prevent the pressure from exceeding the highest allowable pressure value and ensured the safety of the device when working.

Structure Principle

Structure:
1. Wehn the medium pressure rises to the set pressure, the impulse safety valve will open , and the medium will enter into the piston chamber of the main safety valve from the impulse pipe to drive the piston to descend, while the valve automatically open; when the impulse safety valve closes, the disc will automatically close.
2. The sealing surface is made of Fe-Based Cr-Ni Stainless Steel by over-laying welding. Through thermal treatment, the disc has stronger resistance to wear and erosion.

Installation Instructions

Installation:
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 mains afety valve.
3. The exhause pipe shall contain a special gallows, and the steam exhaust pipe's weight shall not be exerted on the main safety valve. The connecting flange between the main safety valve and exhaust pipe shall be free of any extra prestress.
4. At the lowest point of the exhaust pipe, water drainage shall be taken into consideration to avoid producing water hammer while discharging steam.

Product Details

Main Dimensions:

Model	Nominal Diameter	Connection Size
L	L1	L2	H	D	D1	D2	b	z-d	DN	D	D1	D2	b	z-d
A49H-4	150	220	230	240	486	300	250	204	30	8-25	200	360	310	278	34	12-25
A49H-4	200	270	295	330	615	375	320	260	38	12-30	300	485	430	390	40	16-30
A49H-4	250	300	350	370	646	445	385	313	42	12-34	350	550	490	450	44	16-34

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