Pneumatic valves
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Frequently asked questions
What do 5/2, 5/3 and 3/2 valve designations mean?
The first number is the port count, the second the number of positions. A 5/2 valve drives a double-acting cylinder, a 3/2 serves a single-acting cylinder or on/off supply. A 5/3 adds a centre position: closed, exhaust or pressure centre, depending on how the actuator must stop mid-stroke.
What should I check on the coil when replacing a solenoid valve?
Check the voltage and current type (24 VDC, 110 VAC, 220 VAC), the connector style (DIN, plug-in, flying leads) and the power rating. An AC coil on DC supply, or the reverse, will burn out or fail to pull in. With an indicator lamp or surge suppressor, observe polarity on DC coils.
What is the Cv or Kv flow coefficient used for?
Cv and Kv express how much air a valve passes, which sets the speed the cylinder can reach. An undersized valve slows the cylinder even at full pressure. When substituting another brand, compare Cv or nominal flow in l/min rather than port size alone.
Can I replace a single valve on a manifold?
Yes, if the new valve shares the base interface, for example ISO 5599 for larger valves or the same manifold series of one maker. A body-ported valve will not fit a sub-base and vice versa. Photograph the base face and record both base and valve codes when sourcing.
Why does a solenoid valve hum or fail to shift?
An AC coil that hums usually has dirt on the plunger seat or is running below rated voltage. A valve that fails to shift may be fed below the minimum pressure of an internally piloted design, or its spool may be gummed by contaminated oil. Use the manual override button to separate an electrical fault from a mechanical one.
How do internal pilot and external pilot valves differ?
An internally piloted valve takes its control air from the supply port, so it needs a minimum pressure, typically around 1.5 to 2 bar, before it shifts. An externally piloted valve receives control air through a separate port, which suits low-pressure or vacuum service on the main line. When replacing a valve, keep the pilot type of the original.
Should valve exhaust ports be fitted with silencers?
Yes, because unrestricted exhaust can exceed 90 dB and blow dust into the workplace. The silencer must have enough flow capacity for the valve, otherwise back pressure slows the cylinder. Silencers clogged with oil residue should be cleaned or replaced periodically.
What details are needed to order a solenoid valve?
State the valve function (for example 5/2 single or double solenoid), port thread size, voltage and whether it is AC or DC. Add the electrical connector type (DIN, flying leads, M8 plug) and the mounting style: standalone or on a manifold base. A photo of the old valve's label is often enough to identify an equivalent.
