Globe valves

In recent years, the cage structure through control valve having simple maintenance, changing the seat can be changed with the advantages of the valve flow characteristics and has been widely used. Order to reduce the spool by the effects of unbalanced force, implementing agencies can be thrust through engine valve structure shown in Figure 3 can also be used balanced spool valve cage structure. In the figure, between the upper part of the valve body and the valve cage cylinder graphite lubricated sliding piston ring for sealing between the valve body and the valve cage. Between the cage, and on the valve cover bonnet gaskets, spiral gasket seal upstream high pressure fluid does not enter the downstream low pressure cavity. In addition, the fluid through the top of the spool balanced by the connecting hole, simultaneously in the bottom and top of the valve body, to eliminate most of the static unbalance force, and having a damping effect, reduce the effects of fluid flow induced vibration disturbance. Typically, the balance structure through single-seat control valve with flow to the center of Figure 3 shows the external standard air cylinder
(2) sleeve valve sleeve valve, also known as cage valve spool and cage (sleeve) control valve trim. The sleeve can be through single seat valve, double seat valve or angle valve. Sleeve valve throttle valve cage with the valve cages surface oriented, few meet the desired flow characteristics. The sleeve valve characteristics are as follows.stainless steel pneumatic cylinders