Specifications; Installation - Fisher R622 Instruction Manual

Month Year
Type XXXX
RELiEF VaLVE
SPRing
VaLVE DiSK
inLET PRESSURE
aTMOSPHERiC PRESSURE
inLET PRESSURE
OUTLET PRESSURE
OUTLET PRESSURE
OUTLET PRESSURE
aTMOSPHERiC PRESSURE aTMOSPHERiC PRESSURE
inLET PRESSURE
In addition, Type R622 regulators have internal relief
across the diaphragm to help minimize overpressure.
Any outlet pressure above the start-to-discharge point
of the nonadjustable relief valve spring moves the
diaphragm off the relief valve seat, allowing excess
pressure to bleed out through the screened spring
case vent.

Specifications

The Specifications section lists operating conditions
and other specifications of the Type R622 regulator.
Information specific to a regulator's construction is
stamped on the nameplate.
Principle of Operation
Refer to Figure 2. When downstream demand
decreases, the pressure under the diaphragm
increases. This pressure overcomes the regulator
setting (which is set by a spring). Through the action
of the pusher post assembly, lever, and valve stem,
the valve disk moves closer to the orifice and reduces
gas flow. If demand downstream increases, pressure
under the diaphragm decreases. Spring force
pushes the pusher post assembly downward and the
valve disk moves away from the orifice. Type R622
regulators include an internal relief valve used to help
minimize overpressure. Any outlet pressure above
STEM
ORiFiCE
Figure 2. Type R622 Operational Schematic
the start-to-discharge point of the non-adjustable
relief spring moves the diaphragm off of the relief
seat, allowing excess pressure to discharge through
the vent.

installation

COnTROL
(Main) SPRing
UPPER SPRing CaSE
LEVER
WaRning
!
Personal injury, equipment damage,
or leakage due to escaping gas or
bursting of pressure-containing parts
might result if these regulators are
overpressured or installed where
service conditions could exceed the
limits for which the regulators were
designed, or where conditions exceed
any ratings of the adjacent piping or
piping connections. To avoid such
injury or damage, provide pressure-
relieving or pressure-limiting devices
(as required by the appropriate code,
regulation or standard) to prevent
service conditions from exceeding
those limits.
additionally, physical damage to a
regulator could cause personal injury
and property damage due to escaping
Type XXXX
Type R622
3