The influence of medium flow direction change of pneumatic control valve

Medium flow direction change on the influence of the pneumatic control valve flow direction of medium is to introduce the below change on the influence of the pneumatic control valve, usually in the engineering requirement for pneumatic control valve flow has 3 kinds: 1) the flow does not make the request, such as ball valve, the common butterfly valve flow; Have strict regulations requirements, (2) to flow after generally cannot change, such as three-way valve, venturi valve, double sealing belt balance hole sleeve valve; (3) according to the process conditions, the user choose the reasonable flow, such as single seat valve, Angle valve, high pressure valve, the balance hole of the sealing sleeve valve, small flow pneumatic control valve, etc. Valve to determine for the first 3 kinds of circumstances, misconceptions exist in the engineering, such as Angle valve, generally considered medium flow at the bottom in side out. In order to solve this misunderstanding, the article made some analysis. The change of the medium flow direction, to maintain the same pressure switch, pneumatic control valve and lead to the effect of unbalanced force is changed. Disturbed flow direction of medium on the valve core to change at the same time, make the flow changes, leading to fluid resistance is different. A change, pneumatic pneumatic - valve Fl direction when the influence of the pneumatic control valve performance for ds pneumatic - valve internal parts wear introduces the pneumatic control valve is the moving parts in the fluid flow control system, constant throttling and often cut off the flow; So, use under harsh conditions, trim wear is expected. Due to wear and tear, trim the easy to change is one of the important matters should be considered in the design of pneumatic control valve. Pneumatic control valve valve core and valve seat wear materials cause valve leakage, changed the flow characteristic, in the event of serious wear and tear, will form a new flow and may penetrate the body wall.