| Operation
Flow enters the unit and makes a right angle to the outlet
port across the nose of a magnetic piston. The piston
is held in place by attraction to an adjusting screw
magnet. A pressure differential is created by flow across
the piston. When the differential is great enough, the
piston slides to a seat at the outlet port. The flow
rate at which the piston actuates can be changed externally
by turning the adjusting screw, thereby changing the
piston's relationship with the flow stream.
In this auto reset model after actuation,
the piston rests on a metal to metal seat which allows
a controlled bleed. To reset the unit, pressure must
be equalized on both sides of the piston. If the source
is turned off, either upstream or downstream, the bleed
will equalize the pressure and the valve will automatically
reopen by magnetic repulsion from the fixed magnet located
in the valve body.
For positive shut-off an elastomer is
used on the nose of the piston. When it comes to rest
on the seat it provides a bubble tight closure. To reopen
the valve there are two options.
-
The upstream pipeline must be bled
to atmosphere if the line downstream is at atmosphere.
-
A by-pass line with an on/off valve
must be installed to port the upstream pressure
to the downstream pipeline to equalize the pressure.
Our MRS series is available with the by-pass
system as an integral part of the unit.
-
Actuation points for air at 68° F
and 14.7 PSIG.
-
Corrections must be used for other
gases, line pressures and temperatures.*
-
Please consult your representative
or the factory.
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