H62Y 4 way outlet globe check valve manufacturer, factory and supplier. H62Y 4 way outlet globe check valve is also called High-pressure outlet check valve: This check valve is generally suitable for clean media and is not suitable for media containing solid particles and with high viscosity. H62Y 4 way outlet globe check valve is an important fluid control device, widely used in various industrial pipeline systems. Its main function is to prevent the backflow of the medium and ensure the normal operation of the pipeline system.
H62Y 4 way outlet globe check valve material:
Valve body: Carbon steel
Valve cover: Carbon steel
Valve stem: Chromium-molybdenum steel
Sealing ring: Flexible graphite
Valve disc: Hard alloy
Valve seat: Hard alloy
Packing: Flexible graphite
H62Y 4 way outlet globe check valve main model specifications of the four-way valves at the inlet and outlet of the carbon steel high-pressure header:
Model: H61Y; H62Y Nominal Pressure: PN 20.0, 25.0, 30.0 MPa
Nominal diameter: DN 150, DN175, DN225, DN275, DN300 mm
H62Y 4 way outlet globe check valve Structural features:
The middle chamber of the valve adopts a self-sealing pressure structure, ensuring excellent sealing performance.
2. At the upper part of the valve, a handwheel locking structure is designed. During unit tripping, maintenance, or when the high-pressure heater is shut down, by unscrewing the handwheel to release the pressure on the valve disc, water leakage from the feedwater can be prevented from entering the high-pressure heater and causing damage to the sealing surfaces. It also prevents accidental operation from allowing feedwater to enter the high-pressure heater, and enables the valve to be closed smoothly in case of unexpected blockage.
3. The inlet valve adopts an external piston chamber structure. The controlled medium is condensate water. The control system, operating under low temperature, low pressure and low pressure difference conditions, has high reliability.
The inlet valves (entry valves) and the outlet valves (outlet check valves) series products are used for the inlet and outlet of the high-pressure heater of 50MW-600MW boilers, serving as protection valves for the high-pressure heaters. During the operation of the high-pressure heaters, if there is a leakage in the piping system or the drain valve malfunctions, it will cause the water level on the steam side to rise, which may lead to the reverse flow of high-pressure feedwater into the turbine. To prevent such accidents, when the water level on the steam side reaches the alarm level, the contacts of the electric contact water level transmitter are connected, and the electromagnetic valve is quickly opened and closed. Condensate water enters above the piston of the inlet valve, the inlet valve flap closes, and the feedwater to the inlet high-pressure heater is cut off. At the same time, the bypass is opened, and the feedwater enters the boiler through the bypass, and the high-pressure heater is de-energized, thereby ensuring the normal operation of the unit. When the high-pressure heater is put into operation, the valve flap of the inlet valve automatically opens under the pressure of the feedwater in the system and cuts off the bypass. The feedwater passes through the high-pressure heater and enters the boiler, thereby improving the thermal efficiency of the power plant and ensuring the safe operation of the unit.
The working principle of the H62Y 4 way outlet globe check valve :
H62Y 4 way outlet globe check valve mainly relies on the self-flow of the medium to achieve the automatic opening and closing of the valve disc, in order to prevent the backflow of the medium. Specifically, when the medium flows in the designated direction through the check valve, the pressure of the fluid acts on the valve disc. When this flow pressure exceeds the opening pressure of the check valve, the valve disc will be pushed open by the fluid pressure, thereby allowing the medium to continue flowing through the valve.
However, when the flow direction of the medium changes and reverse flow occurs, the working mechanism of the check valve will be different. In the case of reverse flow, the valve disc will automatically close and tightly adhere to the valve seat under the action of fluid pressure and its own gravity, thereby cutting off the reverse flow of the medium. The greater the pressure of the reverse-flowing medium, the tighter the valve disc closes and the better the sealing effect, completely eliminating the possibility of medium backflow.
