H741X Hydraulic Quick Close Steam Extraction Check Valve

H741X Quick close Steam Turbine Extraction Check Valve is mainly used for urgent stop flow back medium in the power plant steam turbine system. As emergency shut off valve, it can be closed in 0.5~1 S second to prevent steam turbine being damaged by back flowing medium (Steam and Cooling water) of the conduits.
Standard and Scope:
                                                                                                                                  
H741X Quick close Steam Turbine Extraction Check Valve
Size: NPS 6"~48" DN150~DN1200 (Others upon request)                               
Pressure Rating: Class 150~600 PN10~PN100 (others upon request)               
Connection: Double flange, Butt weld   
Material: Carbon steel, Alloy steel, Stainless steel; WCB, Q235, 16Mn, WC6, WC9,C12A,CF8
Design and Manufacture: GB/T 12236, GB/T 12238, ASME B16.34 
Test and Inspection: API598, ISO5208, GB/T 13927
Face-to-Face: API609,ISO5752, BS EN558 , Manufacturer standard
End Connection: ASME B16. 5(for NPS≤24); ASME B16.47  MSS SP-44(for NPS>24); BS EN1092-1, GB/T 9113
BW End connection: ASME B16.25, GB/T 12224      
 
H741X Quick close Steam Turbine Extraction Check Valve
Design feature
Stop and check function, close in 0.5 second
Suitable body material was selected to guarantee body strength
Harden sealing face prevent valve damaged by operation
No hinge pin gland helps avoid inhibiting performance
Strong and low friction coefficient bearing was adopted
Tilting swing disc design has low pressure drop
Both vertical disc and inclined disc are available
Both Vertical actuator and Horizontal actuator are available
The disc is positioned at a large inclined angle seat to shorten the travel of opening/ closing, together with one auxiliary pneumatic (hydraulic) device to speed open/close process, short closing time protect steam turbine in time and reliable
The main eccentric structure plus the auxiliary pneumatic(hydraulic)pressure on the disc, the flow stopping and checking functions are realized
Triple eccentric structure design seat and disc, combined with inclined seat geometry, facilitates an tight seal with least friction.

H741X Quick close Steam Turbine Extraction Check Valve
[Extraction check valve use and performance specifications]
H664Y valve is used in non-corrosive media such as water suction system of power plant or thermal power plant, or Other system, to prevent sudden reduction of pressure in steam turbine when steam turbine load is applied, steam in the extraction pipe and each heater reverse flow into steam turbine Causes the steam turbine to shatter and destroy the turbine Generator. It will prevent the leakage of the heater system piping and close the water from the extraction steam. When the feedwater heater is at a high water level, the pneumatic device components will be connected to the liquid. After counter-current signals, the turbines are quickly separated to provide maximum protection to the turbine or the pumping system.
 
[Air circuit system working principle]
       The air source comes from the compressed air (air source pressure 0.4~0.6Mpa). After the ball valve enters the two-position three-way solenoid valve, it finally enters the cylinder air inlet through the quick exhaust valve, and the check valve opens. Manual directional valve is used for the flexibility of running test valve.
      When the check valve closes, the solenoid valve shuts off and shuts off, shutting off the air supply. The quick-discharge valve starts and the air in the lower chamber of the cylinder is exhausted. The check valve closes quickly.
      Electromagnetic valves, air handling components and other control components, according to the requirements of the turbine plant using the United States ASCO imported products, but also can be equipped with other domestic and foreign manufacturers of high quality products to ensure excellent performance and high reliability.
Structural features
1. The sealing surface surfacing Cr13 series stainless steel or cobalt-based hard alloy has good wear resistance, and the sealing performance is stable and reliable.
2. When the medium is flowing in the forward direction, the air is injected into the lower chamber of the cylinder and acts together with the weight to balance the valve flap in the fully open position. When the medium is flowing in the opposite direction, the lower chamber of the cylinder piston is quickly relieved and the valve flap closes quickly within 0.5 seconds.
3. The weight hammer acts on the pin shaft through the extension rod and the shift fork to balance the weight and the moment of the rocker to prevent the water hammer phenomenon from occurring. When the medium flows in the forward direction, it helps to open the valve and keep the valve stable and reduce vibration during operation.
 
H741X Quick close Steam Turbine Extraction Check Valve is mainly used for urgent stop flow back medium in the power plant steam turbine system. As emergency shut off valve, it can be closed in 0.5~1 S second to prevent steam turbine being damaged by back flowing medium (Steam and Cooling water) of the conduits.
Standard and Scope:
                                                                                                                                  
H741X Quick close Steam Turbine Extraction Check Valve
Size: NPS 6"~48" DN150~DN1200 (others upon request)                               
Pressure Rating: Class 150~600 PN10~PN100 (others upon request)               
Connection: Double flange, Butt weld   
Material: Carbon steel, Alloy steel, Stainless steel; WCB, Q235, 16Mn, WC6, WC9,C12A,CF8
Design and Manufacture: GB/T 12236, GB/T 12238, ASME B16.34 
Test and Inspection: API598, ISO5208, GB/T 13927
Face-to-Face: API609,ISO5752, BS EN558 , Manufacturer standard
End Connection: ASME B16. 5(for NPS≤24); ASME B16.47  MSS SP-44(for NPS>24); BS EN1092-1, GB/T 9113
BW End connection: ASME B16.25, GB/T 12224      
 
H741X Quick close Steam Turbine Extraction Check Valve
Design feature
Stop and check function, close in 0.5 second
Suitable body material was selected to guarantee body strength
Harden sealing face prevent valve damaged by operation
No hinge pin gland helps avoid inhibiting performance
Strong and low friction coefficient bearing was adopted
Tilting swing disc design has low pressure drop
Both vertical disc and inclined disc are available
Both Vertical actuator and Horizontal actuator are available
The disc is positioned at a large inclined angle seat to shorten the travel of opening/ closing, together with one auxiliary pneumatic (hydraulic) device to speed open/close process, short closing time protect steam turbine in time and reliable
The main eccentric structure plus the auxiliary pneumatic(hydraulic)pressure on the disc, the flow stopping and checking functions are realized
Triple eccentric structure design seat and disc, combined with inclined seat geometry, facilitates an tight seal with least friction.

H741X Quick close Steam Turbine Extraction Check Valve
[Extraction check valve use and performance specifications]
H664Y valve is used in non-corrosive media such as water suction system of power plant or thermal power plant, or other system, to prevent sudden reduction of pressure in steam turbine when steam turbine load is applied, steam in the extraction pipe and each heater reverse flow into steam turbine Causes the steam turbine to shatter and destroy the turbine generator. It will prevent the leakage of the heater system piping and close the water from the extraction steam. When the feedwater heater is at a high water level, the pneumatic device components will be connected to the liquid. After counter-current signals, the turbines are quickly separated to provide maximum protection to the turbine or the pumping system.
 
[Air circuit system working principle]
       The air source comes from the compressed air (air source pressure 0.4~0.6Mpa). After the ball valve enters the two-position three-way solenoid valve, it finally enters the cylinder air inlet through the quick exhaust valve, and the check valve opens. Manual directional valve is used for the flexibility of running test valve.

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