Datasheet

4
56
Subject to change
SOLENOID VALVES, MECHANICAL AND MANUAL VALVES
A
valve spool change position inside the valve when
it is affected manually, with spring force, or when
power is applied to the coil. The spool position de-
termines which ports are pressurised and exhausted.
Many valves have a so called rubber seal, which can
be compared to a rubber O-ring. This type of seal works
very well and is found in many of SMC’s valves.
In some applications, for example high-frequency
applications, rubber seal can wear out, and the valves
need to be replaced regularly.
SMC offer an optional metal seal for these applica-
tions. This option extends the life time of the valve and
your application.
A metal seal spool moves in a xed sleeve, which in
turn is rubber sealed against the valve body. The t be-
tween spool and sleeve is very precise.
■ At least 200 million cycles life time. There are docu-
mented cases where more than 1 billion cycles have
been achieved.
■ Less sensitive to impurities than conventional rubber
seal valves.
■ Friction free.
■ Air gap between spool and sleeve.
■ Highest precision, surface nish, and small gap (1 µm).
■ Minimum leakage (slightly more than rubber seal
valve).
Valve series available with metal seal: EVS, SQ, SY,
VQ1000/2000/4000, VQ7, VQC and VSS.
SMC’s metal seal valves
Valves in high-frequency use often suffer from wear on the seals.
SMC’s metal seal valves resist such wear and have superior life time.
Detail of the metal spool inside its sleeve.