5
Pressure Regulators with Type SP/P Safety Pilot
Dismantling and Reassembling
Main Valve
1. To completely dismantle the main valve, remove
blind flange from top and then remove the bottom
cover or hood.
2. Remove the diaphragms and then, remove the two
stem nuts from the top one at a time by holding
the pressure plate on the bottom with two screw
drivers (don’t use only one or you will probably
bend the stem). The whole stem assembly will
then come out through the bottom of the valve.
3. In cleaning and reassembling, clean stem with fine
emery cloth till shiny.
4. Lap disk to seat and also lap disk to shoulder on
stem with fine compound.
5. Tighten stem nuts one at a time, making sure that
disk is butted up against shoulder on stem.
6. Wipe off diaphragms, making sure there is no
dirt around the edges where they are pinched by
the valve.
7. Tighten hood, working back and forth on opposite
bolts. Do not start on one bolt and work around the
circle or you will probably have a leak.
Safety Pilot
1. Remove the blind flange and using a
15/16 in. / 23.8 mm long socket, remove the seat
and disk assembly.
2. Remove the stem nuts then clean all parts.
3. Lap disk to seat and stem shoulder with fine
grinding compound and reassemble, making sure
that disk is pulled up tight against stem shoulder.
4. To remove bellows seal, remove nuts at extreme
ends of the standards and remove entire
diaphragm assembly from body of pilot.
5. The bellows seal can then be unscrewed.
Pilot (Type D)
1. Remove adjusting spring (or weight), and
dismantle pilot at diaphragm joint.
2. Remove blind flange and screen. Holding the
hexagon pusher plate at top end, remove the two
stem nuts, one at a time.
3. Clean all parts thoroughly and lap disk to seat and
stem shoulder with fine grinding compound.
4. Reassemble, making sure that disk is pulled up
tight against stem shoulder.
