The movement from the closed position to the nominal distance of the fully open position. Rated fully open position is the maximum opening recommended by the manufacturer.
Relative flow coefficient: the specified stroke flow coefficient (Cv value) with rated travel between the flow coefficient (Cv), ratio.
Seat leakage: o of the amount of fluid flowing through the valve when the valve is in the fully closed position when the predetermined pressure and temperature,
The spring coefficient: per unit length of the spring changes the spring force of the change. The membrane actuator control valve, spring coefficient is usually lbf / inch compression expressed as the amount.
Stem unbalanced force: due to the fluid pressure generated in an arbitrary position on the stem of the net force.stainless steel pneumatic cylinders
The reduced flow cross section: maximum velocity, the hydrostatic pressure and the smallest cross-sectional area at that part stream. The reduced flow cross section is typically located in a control valve, downstream of the actual physical limitations.
ANSI: American National Standards Organization abbreviations.
API: American Petroleum Institute abbreviation.
ASME: American Society of Mechanical Engineers abbreviations.
ASTM: American Society for Testing and Materials Society abbreviation.direct acting solenoid valves
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