The double seat regulator cannot be used as a shut-off valve.
The spool of the double-seat control valve has the advantage of a force balance structure, which can make the pressure difference range between the front and the back of the valve larger. Since the two sealing surfaces cannot be in good contact at the same time, the leakage is large and cannot be cut off in the pipeline. Now the double-seat valve is improved by adding a sleeve, but the carbon canister solenoid valve cannot change the limitations of its structural design.
Comparison of anti-blocking performance between direct-acting control valve and angle-acting control valve.
The spool of the direct-flush control valve moves vertically, the fluid moves horizontally, and the flow channel structure in the valve cavity is non-straight, generally in an S shape, which will transform into many blind areas. Over time, these blind areas are easy to occur The media precipitates, which can easily cause clogging. The spool of the angular-stroke valve rotates horizontally, and the medium flows horizontally, so there is no dead angle and the sediment is easy to be carried away by the fluid. Therefore, the solenoid valve control linear stroke adjustment valve has better anti-blocking performance than the quarter stroke valve.
Reasons for the thinning of the stem of the straight-way regulating valve
Because of the principle of high sliding friction and low rolling friction. The stem of the direct-acting valve slides up and down, resulting in greater friction. Therefore, the valve stem is designed exquisitely and the PTFE packing with a small friction coefficient is used to reduce the friction force as much as possible. However, this will cause problems such as small valve stem, easy bending, and short sealing life.