Maintenance
▲ WARNING
To avoid personal injury, property
damage or equipment damage caused
by sudden release of pressure or
explosion of accumulated gas, do
not attempt any maintenance or
disassembly without first isolating
the pressure regulator from system
pressure and relieving all internal
pressure from the pressure regulator.
Pressure regulator that have been
disassembled for repair must be
tested for proper operation before
being returned to service. Only
parts manufactured by Emerson
should be used for repairing this
pressure regulator.
Due to normal wear or damage that
may occur from external sources, this
pressure regulator should be inspected
and maintained periodically. The
frequency of inspection and replacement
of parts depends upon the severity of
service conditions or the requirement
of local, state and federal rules
and regulations.
△ CAUTION
Before attempting to replace any spare
parts, be sure to shut off all pressure
connections to the regulator. With
the regulator closed however, system
pressure could still be locked between
the shutoff valve and the inlet and/
or outlet sides of the regulator. Before
proceeding with any regulator service,
be certain to relieve the pressure from
both sides of the regulator.
For ease of operation and maintenance, install the
manual shutoff valves upstream and downstream from
the regulator.
Servicing Diaphragm(s) and
Pressure Spring
1. Loosen the lock nut and turn the adjusting screw
counterclockwise until the pressure spring is
no longer under tension. When reassembling,
run the adjusting screw down until the lock
nut almost touches the spring chamber. This
will give you approximately the same set as
before disassembly.
2. Remove the assembly screws securing the spring
chamber to the body. During reassembly, tighten
the screws evenly in a star pattern. See Chart
below for torque values.
3. Remove the spring chamber. Then remove the
spring button, pressure spring and pressure plate.
4. Remove the diaphragm(s) and diaphragm gasket
(a diaphragm gasket is only present when
construction calls for metal diaphragms).
5. Remove the pusher post button. During
reassembly, ensure the pusher post button is
centered properly on the pusher post.
6. Inspect all parts for wear and damage and
replace if necessary. Reassemble parts in reverse
order. Do not overtighten. Follow the Operation
Instructions to reset the delivery pressure.
Servicing the Cylinder, Piston, Strainer
Screen and Plug Gasket
1. Loosen the lock nut and turn the adjusting screw
counterclockwise until the pressure spring is
no longer under tension. When reassembling,
run the adjusting screw down until the lock
nut almost touches the spring chamber. This
will give you approximately the same set as
before disassembly.
2. Remove the bottom plug. Take care, as the bottom
plug is under slight tension as a result of the piston
spring acting against the bottom plug. Remove the
piston, piston spring and strainer screen.
3. Thoroughly clean the strainer screen and remove
any debris from the valve body.
4. Remove the hexagon cylinder.
5. Inspect all parts for wear and damage. If either the
cylinder or piston need replacing, it is necessary to
replace both as both parts wear equally.
6. Reassemble the valve in reverse order. Do not
overtighten. Follow the Operation Instructions to
reset the delivery pressure.
5
Type D50A
