A49h High Temperature and High Pressure Main Safety Valve

• Media: Water Vapor Oils
• Certification: ISO
• Temperature: High Temperature
• Connection: Flange
• Pressure: Adjustable
• Closed: Semi-Closed
• Model NO.: A49H
• Structure: Spring
• Material: Stainless Steel
• Transport Package: Wooden Box
• Specification: DN50-DN800
• Trademark: xc
• Origin: China
• HS Code: 84814000
• Production Capacity: 10000

Product Description

A49H main safety valve overview

A49H main safety valve is mainly used in power plant boilers, pressure vessels, temperature and pressure reduction devices, to prevent the pressure from exceeding the maximum allowable pressure value, to ensure the safe operation of equipment. When the medium pressure rises to the setting pressure, the impulse safety valve opens, the medium enters the piston chamber of the main safety valve from the pulse tube, pushes the piston down, so that the valve automatically opens, when the impulse valve is closed, the valve disc automatically closes. The sealing surface is made of cobalt-based chromium-nickel stainless steel surfacing, and the valve flap has been heat treated to improve the wear resistance and erosion resistance.

Main safety valve installation instructions

1, the valve must be installed vertically in the highest position of the equipment.
2, the main safety valve is fastened on the support, and the support bears the reverse seating force generated by the main safety valve exhaust steam.
3, exhaust pipe should have a special hanger, exhaust pipe weight shall not be added to the main safety valve, the connection flange between the main safety valve and exhaust pipe should eliminate any additional prestress.
4, the lowest point of the exhaust pipe should be considered drainage, so as not to produce water hammer when exhaust steam.

Main safety valve model: A49H A49Y	Nominal diameter of main safety valve: 150MM-250MM	Main safety valve operating pressure: 4.0MPA
Connection mode of main safety valve: flange connection	Main safety valve form: use with impulse safety valve	Main function of the main safety valve: pressure relief protection
Main safety valve using medium: water. Oil. Steam	Material of main safety valve: cast steel	Main safety valve standard: mechanical ministry standard or custom non-standard

 

 

Main safety valve structure brief

1, when the medium pressure rises to the setting pressure, the impulse safety valve opens, the medium enters the piston chamber of the main safety valve from the pulse tube, pushes the piston down, so that the valve is automatically opened, when the impulse valve is closed, the valve disc is automatically closed.
2, the sealing surface is made of cobalt-based chromium-nickel stainless steel surfacing, and the valve flap is heat treated to improve the wear resistance and erosion resistance.

The main shape and connection size of the main safety valve

Model number	Nominal diameter	Connection 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 and 30
A49H-40	250	300	350	370	646	445	385	313	42	12-34	350	550	490	450	44	16 -

Main items of safety valve order:

Safety valve medium, pressure level, opening mode (full opening/micro opening) set the take-off pressure, determine the valve size, connection mode, standard maximum temperature resistance, release flow/hour, valve body material, internal valve body structure, working principle, installation instructions and other related technical data. Safety valve selection is mainly based on (take-off pressure and neat pressure flow temperature) caliber general design institute will be given, and in fact through the steam pressure, flow and take-off pressure, you can infer the size of the safety valve. Generally, it will be smaller than the caliber selected by the design institute. When the occasion is very important or the environment is more complex, please try your best to provide design drawings and detailed parameters, by our Xuan Cheng valve company experts for your review.