H741X Hydraulic Quick Close Steam Extraction Check Valve

• Customization: Available
• Media: Wog
• Temperature: High Temperature
• Model NO.: GAH741X
• Material: Wcb, Wc6, Wc9, 12crmo, 12crmov, 15CrMo, 15crmov
• Connection Form: Welding
• Structure: Piston
• Pressure: High Pressure
• Function: Non Return
• Sealing Form: Self Tight Pressure Sealing
• Flow Direction: Unidirection
• Standard: ANSI
• Application: Industrial Usage, Water Industrial Usage
• Transport Package: Plywood Case
• Trademark: GOOLE, OEM, ODM
• Origin: China(Mainland)
• HS Code: 8481804090
• Production Capacity: 10000PCS/Year

Product Description

H741X Hydraulic Quick Close Steam Extraction Check Valve

Product Description

H741X Hydraulic Quick Close Steam 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.

H741X Hydraulic Quick Close Steam Extraction Check Valve designed and manufactured by Yongjia Goole Valve Co., Ltd. is based on the imported technology and adopts the most advanced design, manufacturing, material technology and redevelopment to meet the requirements of the domestic 600MW and 1000MW. The steam turbine extraction system of the generator set requires the valve products and its technical performance has reached the international advanced level. It has supplied hundreds of domestic and foreign power companies with hundreds of high-quality and low-cost products. It has been well received by many users and has replaced some imported products. It saves a lot of foreign exchange for the country. This series of products are mainly used in the extraction system of thermal power turbines below 600MW to prevent the back flow of medium or water, and play a protective role for important facilities such as steam turbine pumps. Its performance requirement is that in the very condition that the medium of the pipeline is flowing back, power off, accident, etc., the valve is closed instantly and the closing time is less than 0.5 second.

Working Principle

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.

Specification

H741X Hydraulic Quick Close Steam 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 Hydraulic Quick Close Steam 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.

Product Features

H741X Hydraulic Quick Close Steam 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 Hydraulic Quick Close Steam Extraction Check Valve features
1. Design, manufacture, and acceptance standards are ANSI B16.34, E101, or JB/T3595, and strength and sealing performance fully meets the requirements of the standard.
2.Vacuum test under vacuum condition, the whole life meets user requirements;
3. For different temperatures, the main material is carbon steel or high-temperature steel, and the sealing surface is surfacing hard alloy;
4. The valve flap is designed to be connected with the valve rod through the rocker and can be aligned with the sealing surface of the valve to ensure that the sealing surface is consistent;
5.The valve seat sealing surface is inclined at a certain angle to reduce the closing time, reduce the impact, and protect the safety of the equipment itself and the pipeline;
6.The valve is equipped with a damping weight, which can balance the dynamic torque of the closing part to prevent the occurrence of hammer.
7. The body cavity of the valve adopts a streamlined design, which has large circulation capacity and reduces valve resistance.
8. The actuator is a spring-return type cylinder or hydraulic cylinder, and is relatively independent of the action of the valve closing part. The failure of the actuator does not affect the action of the closing part;
9. The cylinder or the inner wall of the hydraulic cylinder is coated with a wear-resistant and corrosion-resistant layer, which can increase the life span, reduce the resistance of the movement, and make the valve flexible and reliable;
10.The closing part is opened with a limit mechanism to avoid damage caused by opening over position;
11. The actuator is equipped with the valve switch position signal output, valve open position local indication;
12 Targeted design can also be based on specific user requirements.

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.

Installation Instructions

H741X Hydraulic Quick Close Steam Extraction Check Valve design and manufacturing inspection standards
Design and manufacturing standards: ASME/ANSIB16.34, E101, JB/T3595
Structure length standards: JB/T3595, ASME/ANSIB16.10, GB/T12221
Welding end or flange standard: GB/T12224, ASME/ANSIB16.25, GB/T9113, JB/T79~JB/T82
Test acceptance criteria: JB/T9092, JB/T3595, ASME/ANSIB16.34, E101

Product Parameters

MODEL	CLASS	SHELL TEST	SEAT TEST	APPLICABLE TEMPERATURE	AIR SUPPLY
H664Y-150Lb	150Lb	3.0Mpa	2.2Mpa	≤425ºC	0.6Mpa
H664Y-150LbC6	150Lb	3.0Mpa	2.2Mpa	≤510ºC	0.6Mpa
H664Y-300Lb	300Lb	7.5Mpa	5.5Mpa	≤425ºC	0.6Mpa
H664Y-600Lb	600Lb	15.0Mpa	10.0Mpa	≤425ºC	0.6Mpa
H664Y-900LbC6	900Lb	24.0Mpa	18Mpa	≤510ºC	0.6Mpa
H664H-20	2.0Mpa	3.0Mpa	2.2Mpa	≤425ºC	0.6Mpa
H664H-50	5.0Mpa	7.5Mpa	5.5Mpa	≤425ºC	0.6Mpa
H664H-100	10.0Mpa	15.0Mpa	11.0Mpa	≤425ºC	0.6Mpa
H664Y-64C6	6.4Mpa	9.6Mpa	7.1Mpa	≤510ºC	0.6Mpa
H664Y-100C6	10.0Mpa	15.0Mpa	11.0Mpa	≤510ºC	0.6Mpa
H764H-20	2.0Mpa	3.0Mpa	2.2Mpa	≤425ºC	0.6Mpa(Hydraulic)
H764H-40	4.0Mpa	6.0Mpa	4.4Mpa	≤425ºC	0.6Mpa
H764H-64	6.4Mpa	9.6Mpa	7.1Mpa	≤425ºC	0.6Mpa

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