Type HSR
3
UPPER SPRING
CASE
STEM
VALVE DISK
ORIFICE
LEVER
PUSHER
POST
RELIEF VALVE
SPRING
CONTROL (MAIN)
SPRING
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
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
stem, the valve disk moves closer to the orice and reduces
gas ow. If demand downstream increases, pressure under
the diaphragm decreases.
Spring force pushes the pusher post assembly downward and
the lever, stem and valve disk move away from the orice.
The Type HSR regulators include an internal relief valve
for overpressure protection. If the downstream pressure
exceeds the regulator setting by 7-inch w.c. to 1.25 psig /
17 to 86 mbar, depending on the main spring used, the relief
valve opens and excess gas escapes through the vent in the
upper spring case.
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 gas. To avoid such
injury and damage, install the regulator in a
safe location.
A regulator may vent some gas to the
atmosphere in hazardous or ammable gas
service, vented gas might accumulate and
cause personal injury, death or property
damage due to re or explosion. Vent a
regulator in hazardous gas service to a
remote, safe location away from air intakes or
any hazardous location. The vent line must be
protected against condensation or clogging.
Before installing the regulator, check for damage which might
have occurred in shipment. Also check for dirt or foreign
matter which may have accumulated in the regulator body or
in the pipeline. Apply pipe compound to the external threads
of the pipeline and install the regulator so that the ow is in
the direction of the arrow cast on the side of the body. The
diaphragm actuator assembly can be rotated to any position
relative to the body, in 90° increments. Remove the two cap
screws (key 17) that hold the body to the actuator in order
to rotate the diaphragm actuator assembly.
Figure 2. Type HSR Pressure Regulator Operational Schematic
E0908
UPPER SPRING
CASE
STEM
VALVE DISK
ORIFICE
LEVER
PUSHER
POST
RELIEF VALVE
SPRING
CONTROL (MAIN)
SPRING
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
(1 Seiten)
(8 Seiten)
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