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Type SR8
Figure 3. Type SR8 Exploded View
4
CLOSING CAP
ADJUSTING SCREW
LOCKNUT
SPRING CASE
UPPER SPRING SEAT
Installation
Clean out all pipelines before installation of the
regulator and check to be sure the regulator has not
SPRING
been damaged or collected foreign material during
HEX NUT
shipping. The regulator may be installed in any
SPLIT WASHER
position desired. However, to ensure self-draining
FLAT WASHER
(from inlet to outlet) the regulator should be installed
with the spring case in the upright vertical position.
LOWER SPRING SEAT
The arrow on the body indicates flow direction.
The piping flange to regulator end connection
PISTON RING
flange clamps and gaskets are supplied by the
(SPRING SIDE UP)
user. Clamp gaskets must be compatible with the
system requirements. Install and tighten clamps to
GUIDE RING
manufacturer's specifications.
DIAPHRAGM
PLUG O-RING
PLUG
Pressure Loaded Construction
The spring case can be pressure loaded to adjust set
pressure. An optional tapped spring case, guide ring
seal and sealing washer on the adjusting screw must
SANITARY CLAMP
be used for these applications. The loading pressure is
connected to the 1/4 NPT connection in the spring case
allowing registration on the spring side of the diaphragm.
BODY
Adjusting loading pressure will proportionally change
the pressure setting of the regulator. A small amount of
mechanical spring load, in addition to the pressure load, is
recommended. Regulator set pressure achieved from the
combination of spring load and pressure load should not
exceed the set pressure ranges listed in Table 2.
WARNING
!
Regulators should be installed, operated
and maintained in accordance with
federal, state and local codes, rules and
regulations and Fisher™ instructions.
If a leak develops in the system,
it indicates service is required.
Failure to take the regulator out of
service immediately may create a
hazardous condition.
Note
It is important that the regulator be
installed so that the vent hole in the
spring case is unobstructed at all times.
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