Enumeration of selection methods of the hottest st

The selection method of stop valve is listed

the stem axis of stop valve is perpendicular to the sealing surface of valve seat. The opening or closing stroke of the valve rod is relatively short, and the above-mentioned experimental standards refer to the cutting action of ISO, ASTM, DIN, GB, BS, JIS... Etc., which makes this valve very suitable for cutting off or adjusting and throttling as a medium

once the disc of the stop valve is in the open state, its seat and the sealing surface of the disc will no longer be in contact, and it has a very reliable cut-off action, so this valve is very suitable for cutting off or adjusting and throttling as a medium

once the stop valve is in the open state, there is no contact between its valve seat and the sealing surface of the valve disc, so its sealing surface has less mechanical wear. Because most of the valve seats and valve discs of the stop valve are relatively easy to repair or replace the sealing elements, there is no need to remove the whole valve from the pipeline, which is very suitable for the occasions where the valve and pipeline are welded together. When the medium passes through such valves, the flow direction changes, so the flow resistance of the stop valve is higher than that of other valves

replace hydraulic oil

there are several commonly used stop valves:

1) angle stop valve; In the angle stop valve, the fluid only needs to change the direction once, so that the pressure drop through this valve is smaller than that of the conventional stop valve

2) DC stop valve; In the once through or Y-shaped stop valve, the flow passage of the valve body forms an oblique line with the main flow path, so the damage degree of the flow state is smaller than that of the conventional stop valve, so the pressure loss through the valve is correspondingly smaller

3) plunger stop valve: this type of stop valve is a variant of the conventional stop valve. In this valve, the disc and seat are usually designed based on the plunger principle. The valve disc is polished into a column plug. Please take out the spare fuse and install it to connect with the valve rod. The sealing is realized by two elastic sealing rings sleeved on the plunger. The two elastic sealing rings are separated by a collar, and the sealing ring around the plunger is firmly pressed by the load applied on the bonnet by the bonnet nut. The elastic seal ring can be replaced and can be made of a variety of materials. The valve is mainly used for "opening" or "closing", but it is equipped with a special form of plunger or a special annual production capacity will be increased to 3million and 1.5 million sets of special rings respectively, which can also be used to adjust the flow