Float-type valve design, high pressure or large diameter will produce higher operating torque, but better sealing 2, throttle valve does not apply, because, when the valve partially open, its sealing surface exposed to fluid in the damaged processing 3, for critical operations, should consider buying a fitted tee and valve stem lubrication fittings, as lubrication can prevent minor leaks, reduce operating torque, if needed, and bleed off valve has two functions, should be provided independent of the lubrication fitting valve ball vent hole There are various forms of check valves include: swing, lift, ball, piston and separate round circled check valves.
针型阀浮球式阀门的设计，在高压或者大管径时会产生高操作力矩，但是密封性好一些 2、球阀不适用于节流，因为，当阀门部分打开时，其密封表面会暴露在处理流体中而受到损坏 3、对于关键性的作业，应该考虑购买装有球座和阀杆润滑配件的球阀，因为润滑可以防止轻微渗漏，减小操作力矩，如果需要阀具有关断和泄放两个功能，则应提供独立于润滑配件的球体泄放孔止回阀止回阀有各种形式：包括旋启式、升降式、球式、活塞式和分离圆盘旋启式止回阀。