Type SR8
4
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.
Installation
Clean out all pipelines before installation of the
regulator and check to be sure the regulator has not
been damaged or collected foreign material during
shipping. The regulator may be installed in any
position desired. However, to ensure self-draining
(from inlet to outlet) the regulator should be installed
with the spring case in the upright vertical position.
The arrow on the body indicates ow direction.
The piping ange to regulator end connection
ange clamps and gaskets are supplied by the
user. Clamp gaskets must be compatible with the
system requirements. Install and tighten clamps to
manufacturer’s specications.
Note
It is important that the regulator be
installed so that the vent hole in the
spring case is unobstructed at all times.
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 be used
for these applications. The loading pressure is connected
to the 1/4-inch NPT connection in the spring case
allowing registration on the spring side of the diaphragm.
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.
Figure 3. Type SR8 Exploded View
CLOSING CAP
ADJUSTING SCREW
LOCKNUT
SPRING CASE
UPPER SPRING SEAT
SPRING
HEX NUT
SPLIT WASHER
FLAT WASHER
LOWER SPRING SEAT
PISTON RING
(SPRING SIDE UP)
GUIDE RING
DIAPHRAGM
PLUG O-RING
SANITARY CLAMP
BODY
PLUG
(16 Seiten)
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