Emerson Fisher R622 User Manual

Type R622
3
Type XXXX
MXXXX
Month Year
Type XXXX
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Figure 2. Type R622 Operational Schematic
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.
Specications
The Specications section lists operating conditions
and other specications of the Type R622 regulator.
Information specic 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 orice and reduces
gas ow. 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 orice. Type R622
regulators include an internal relief valve used to help
minimize overpressure. Any outlet pressure above
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
!
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
CONTROL
(MAIN) SPRING
UPPER SPRING CASE
LEVER
STEM
ORIFICE
VALVE DISK
RELIEF VALVE
SPRING
ATMOSPHERIC PRESSURE
INLET PRESSURE
OUTLET PRESSURE
Type XXXX
MXXXX
Month Year
Type XXXX
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE

Emerson Fisher R622 Specifications

General

Brand	Emerson
Model	Fisher R622
Category	Controller
Language	English