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Manual: 152-082010 301-305-306_303-307 Series Page 23 of 35
3.7. Control Valve
The control valve is an “automatic metering solenoid” valve (see Figure 3-3). While most solenoid valves
operate in either the fully open or closed positions, the automatic metering solenoid valve is designed to
control flow. A spring is used to hold a magnetic plunger assembly tightly against an orifice, thereby
shutting off the flow. The magnetic plunger assembly is surrounded by a coil of magnet wire. When the
coil is energized the electric current passing through the wire coil produces a magnetic field which
attracts the plunger. The plunger assembly moves away from the orifice allowing the gas flow to pass
between the orifice and the plunger seat. The distance between the orifice and the plunger seat, and
thus the flow through the valve, is controlled by the amount of current supplied to the coil.
The valve seat is made of Kalrez (or equivalent) perflouroelastomer. The valve orifice is made from 316
stainless steel. The valve plunger and pole piece are made of nickel plated magnetic alloy (Hi-perm 49)
and the control springs are made of 302 stainless steel. The Diaphragm and all seals are as specified per
the customer order (Viton, Neoprene, Buna-N or Kalrez).
Figure 3-3