The stem axis of the shutoff valve is perpendicular to the seat sealing surface. The valve stem has a relatively short opening or closing stroke and a very reliable shut-off action, making this valve ideal for use as a medium for cutting or regulating and throttling. Once the valve flap of the shut-off valve is in the open state, its valve seat and the valve sealing surface are no longer in contact with each other, and it has a very reliable cutting action. This valve is very suitable as the cutting or adjusting and section of the medium. Stream usage.
Once the shut-off valve is open, there is no contact between its seat and the disc sealing surface, so its sealing surface is less mechanically worn, because the valve seat and disc of most shut-off valves are easier to repair or replace. It is not necessary to remove the entire valve from the pipeline when sealing the components, which is very suitable for the case where the valve and the pipeline are welded together. The flow direction of the medium as it passes through such a valve changes, so the flow resistance of the shut-off valve is higher than other valves.
Commonly used shut-off valves are as follows: 1) An angle-type shut-off valve; in a corner-type shut-off valve, the fluid only needs to change in one direction, so that the pressure drop through the valve is smaller than that of a conventional structure. 2) DC type stop valve; in the DC or Y-shaped stop valve, the flow path of the valve body is inclined with the main flow path, so that the degree of damage of the flow state is smaller than that of the conventional stop valve, and thus the pressure loss through the valve is correspondingly Small. 3) Plunger shut-off valve: This type of shut-off valve is a variant of a conventional shut-off valve. In this valve, the flap and seat are usually designed based on the principle of the plunger. The valve flap is polished into a plunger that is coupled to the valve stem, and the seal is achieved by two elastomeric sealing rings that are placed over the plunger. The two elastomeric seals are separated by a collar and the seal around the plunger is pressed by the load exerted by the bonnet nut on the bonnet. The elastomeric seal can be replaced and can be made from a wide variety of materials. The valve is mainly used for "opening" or "off", but with a special form of plunger or special collar, it can also be used to regulate flow. .
Once the shut-off valve is open, there is no contact between its seat and the disc sealing surface, so its sealing surface is less mechanically worn, because the valve seat and disc of most shut-off valves are easier to repair or replace. It is not necessary to remove the entire valve from the pipeline when sealing the components, which is very suitable for the case where the valve and the pipeline are welded together. The flow direction of the medium as it passes through such a valve changes, so the flow resistance of the shut-off valve is higher than other valves.
Commonly used shut-off valves are as follows: 1) An angle-type shut-off valve; in a corner-type shut-off valve, the fluid only needs to change in one direction, so that the pressure drop through the valve is smaller than that of a conventional structure. 2) DC type stop valve; in the DC or Y-shaped stop valve, the flow path of the valve body is inclined with the main flow path, so that the degree of damage of the flow state is smaller than that of the conventional stop valve, and thus the pressure loss through the valve is correspondingly Small. 3) Plunger shut-off valve: This type of shut-off valve is a variant of a conventional shut-off valve. In this valve, the flap and seat are usually designed based on the principle of the plunger. The valve flap is polished into a plunger that is coupled to the valve stem, and the seal is achieved by two elastomeric sealing rings that are placed over the plunger. The two elastomeric seals are separated by a collar and the seal around the plunger is pressed by the load exerted by the bonnet nut on the bonnet. The elastomeric seal can be replaced and can be made from a wide variety of materials. The valve is mainly used for "opening" or "off", but with a special form of plunger or special collar, it can also be used to regulate flow. .
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