Olive Oil Join Merchants [schoolboy] Plunger valve is composed of valve body, valve cover, valve stem, plunger, orifice frame, sealing ring, handwheel and other parts. When the handwheel rotates, the plunger is driven by the valve stem in the middle of the orifice frame up and down reciprocating movement to complete the opening and closing function of the valve. Globe valve opening and closing parts are plug-shaped valve flap, the sealing surface is flat or conical, the valve flap along the center line of the fluid for linear motion. Plunger valve closure by a stainless steel plunger, the upper and lower two rich elastic sealing ring and a metal spacer frame, the sealing effect by the plunger and the sealing ring to achieve a close fit, the plunger is inserted in the two sealing ring, the sealing area is much larger than the ordinary globe valves; switching plunger valves, the plunger in the sealing ring moves slowly, the contact surface is almost no wear, close, the plunger is inserted into the sealing ring under the truncation of the flow path; open, the plunger When closing, the plunger is inserted into the lower sealing ring to cut off the flow path; when opening, the plunger is detached from the lower sealing ring, but it is still hidden in the upper sealing ring to keep it isolated from the outside world without leakage. Globe valve belongs to the mandatory sealing valve, so when the valve is closed, the valve must be applied to the valve flap pressure, in order to force the sealing surface does not leak. When the medium from below the valve flap into the valve, the operating force needs to overcome the resistance, is the friction of the valve stem and packing and by the pressure of the medium produced by the thrust, the force of the valve off than the force of the valve, so the diameter of the valve stem piston valve is composed of the valve body, bonnet, valve stem, plunger, hole frame, sealing ring, handwheel and other parts.