Product name: DH61F Welded Low Temperature Check Valve
Material: Stainless steel
Product introductionThe low temperature check valve refers to a valve that automatically opens and closes the valve flap depending on the flow of the medium itself, and is used to prevent the medium from flowing backward. The check valve is an automatic valve, and its main function is to prevent the medium from flowing backward, to prevent the pump and the drive motor from reversing, and to release the medium from the container.
Definition of DH61F welding low temperature check valve:
The low temperature check valve refers to a valve that automatically opens and closes the valve flap depending on the flow of the medium itself, and is used to prevent the medium from flowing backward. The check valve is an automatic valve, and its main function is to prevent the medium from flowing backward, to prevent the pump and the drive motor from reversing, and to release the medium from the container. Check valves can also be used to supply lines to auxiliary systems whose pressure may rise above the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
Main performance specifications of DH61F welded low temperature check valve:
Test pressure at room temperature: 300 7.5 0.6 0.6
Low temperature seal test pressure (MPa): 600 15.0 0.6 0.6
Working temperature and applicable medium: 150 3.0 0.6 0.6 -46 ℃, ammonia, liquid nitrogen, propane-101 ℃ ethylene, carbon dioxide-196 ℃ methane, liquefied natural gas
Classification of DH61F welding low temperature check valve:
I. Swing check valve: The disc of the swing check valve is disc-shaped and rotates around the rotation axis of the valve seat channel. Because the channel inside the valve is streamlined, the flow resistance is higher than that of a lift check valve. It is small, suitable for large-bore occasions with low flow rate and infrequent flow, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of lifting type. There are three types of swing check valves: single, double and multiple. These three types are mainly divided by the valve diameter. The purpose is to prevent the hydraulic shock when the medium stops flowing or flows backward.
Lift check valve: Check valve with valve disc sliding along the vertical centerline of the valve body. Lift check valve can only be installed on horizontal pipelines. The valve disc can be a ball on a high-pressure small-diameter check valve. . The shape of the valve body of the lift check valve is the same as that of the shut-off valve (common with the shut-off valve), so its fluid resistance coefficient is large. Its structure is similar to the globe valve. The valve body and disc are silent check valves with the globe valve.
with. The upper part of the valve disc and the lower part of the valve cover are processed with a guide sleeve. The valve disc guide can be freely raised and lowered in the valve guide. When the medium flows, the valve disc is opened by the medium thrust. When the medium stops flowing, the valve disc is It drops down on the valve seat and plays a role in preventing the medium from flowing backward. The direction of the inlet and outlet channels of the straight-through lifting check valve is perpendicular to the direction of the valve seat channel; the vertical inlet and outlet check valve has the same direction of the medium inlet and outlet channels as the valve seat channel, and its flow resistance is smaller than that of the straight-through valve.
3. Disc check valve: a check valve whose valve disc rotates around a pin in the valve seat. The disc check valve has a simple structure and can only be installed on a horizontal pipe, which has poor sealing performance.
Fourth, pipeline check valve: the valve slide valve along the center line of the valve. Pipeline check valve is a new type of valve. Its small size, light weight, and good processing technology are one of the development directions of check valves. But the fluid resistance coefficient is slightly larger than the swing check valve.
V. Compression check valve: This valve is used as a boiler feed water and steam shutoff valve. It has the integrated function of a lift check valve and a stop valve or an angle valve.