在线香蕉午夜制作厂

A low-temperature shut-off valve is a valve that moves the closure (valve flap) along the seat centerline. According to the valve flap in this form of movement, the valve seat port change is proportional to the relationship with the valve flap. As the valve stem open or closed stroke is relatively short, and has a very reliable cut off function, and because the change in the valve seat and the valve is proportional to the relationship between the stroke is very suitable for the regulation of the flow. Therefore, this type of valve is very suitable for cutting or adjusting and throttling.

The stem axis of the cryostat valve is perpendicular to the valve seat sealing surface. The stem opens or closes with a relatively short stroke and a very reliable shut-off action, making it ideal for cutting or throttling and throttling media.

Once the low-temperature shut-off valve is in the open state, its valve seat and the valve sealing surface is no longer between the contact, so its sealing surface mechanical wear is small, because most of the valve seat and valve easier to repair or Replacement of sealing elements without the need to remove the entire valve from the pipeline, which is welded to the valve and the pipeline is one of the occasions is very applicable. Media through the flow direction of such a valve has changed, so cut-off valve flow resistance is higher than other valves.

(1) structure than the gate valve is simple, manufacturing and maintenance are more convenient.

(2) sealing surface is not easy to wear and abrasion, good sealing, valve opening and closing valve body sealing surface between the relative sliding, so wear and abrasion are not serious, sealing performance, long service life.

(3) open and close, the valve stroke is small, so cut-off valve height smaller than the gate valve, but the length of the structure than the gate valve.

(4) opening and closing torque, opening and closing more laborious, open and close a long time.

(5) fluid resistance, due to the valve body than the meandering medium channel, the fluid resistance, power consumption.

(6) medium flow direction Nominal pressure PN ≤ 16MPa, the general use of downstream, the media from the valve under the direction of upstream; nominal pressure PN ≥ 20MPa, the general use of counter-current, the media from the valve on the downstream direction. To increase the seal energy. Use, stop valve media can only flow in one direction, can not change the flow direction.

(7) is fully open when the valve flap often eroded.

Commonly used globe valve globe valve, American Standard cut-off valve, German standard cut-off valve, the Japanese standard cut-off valve, bellows globe valve, low temperature globe valve