LVHC valves are available in either 2.75" (70mm) or 1.97" (50mm) flange-to-flange thicknesses, with
rectangular ports of 1.25 x 8.75" (32 x 222mm) or 1.81 x 9.30" (46 x 236mm)
dimensions. These valves are designed for use in high vacuum load-lock systems used in semiconductor processing,
where low vibration and low particle generation are imperative. The valves’ low
outgassing characteristics can be attributed to a fusion welded 300 series stainless steel body, welded
AM-350 stainless steel nesting bellows as well as small cross section O-rings and the elimination of blind internal
cavities. Custom design valves are available on request.
Pneumatic actuators are fitted with mechanical position indicators
which indicate fully open and fully closed positions. This MPI system consists of two single pole, double throw
micro switches fitted with integral hinged lever and roller
actuators. Each micro switch is wired in a normally open
position via a seven pin circular threaded connector. Mating
female cable connectors are included.
Normally closed switch wiring is available on request. Precise positioning of micro switches is made possible by a patented
vernier adjustment mechanism only available on MDC gate valves.
Pneumatic actuators are equipped with dual impulse Herion 24 VDC air control solenoid valves. All solenoid valves are fitted
with DIN type connectors that conform to international standards. DIN connectors provide
simplicity, convenience and fast, easy electrical installation. Solenoid valves are
designed for use with compressed air from 0 to 125psig. Air should be clean and
uncontaminated. When in doubt, install a filter with filtering capacity of 40 microns. Periodically remove
and clean or replace filter element.