Start-up and Setting
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CAUTION
Never open a reducing valve without
positive indication that the high side is
clear of condensate.
1. On pressure reducing valves like Type E5, use
by-pass to fill the delivery system and raise
pressure to slightly below normal required.
2. Close pilot by releasing compression on adjusting
spring. See Figure 3.
3. Open 1/4 in. control pipe valve.
4. Crack outlet stop valve.
5. Crack inlet stop valve.
6. Blow down strainer.
7. Open inlet stop valve and gradually compress
adjusting spring until the valve opens and takes
control at desired pressure.
8. Alternately choke down on the by-pass and open
outlet stop valve until the regulator is on the line.
See individual instructions for other pilots.
Valve Setting
Valve setting is gaged at K to establish correct stem
length and diaphragm position. Dimension K is
supplied with each replacement stem. See Table 5 for
K values.
1. To install new stem (key 13), fasten disk (key 8)
firmly on stem with stem nut.
2. Insert stem and disk assembly in valve and screw
on pressure plate (key 16). Omit spring (key 14)
for this operation.
3. Hold disk on seat and adjust position of pressure
plate until valve setting K is reached.
4. Push pressure plate against stops in base
(key 18).
5. Remove disc, drop out pressure plate and stem,
drill and insert dowel pin (key 15) to lock the joint.
6. Grind off stem projection flush with face of
pressure plate.
Troubleshooting
Failure to Open
If the main valve failed to open check the following
possible causes to properly correct the problem.
• Adjusting spring on pilot may have been
tampered with.
• Initial pressure may be down due to partially closed
supply valve, clogged strainer or other obstruction.
• No. 4A bleed port fitting may have been omitted
and an open coupling substituted.
• Control pipe may be plugged. Most likely points
of obstruction are at shutoff valve and entrance to
delivery main.
• Main diaphragm may be broken. Test with air or
water before dismantling.
Failure to Close
If the main valve failed to close check the following
possible causes to properly correct the problem.
• Adjusting spring on pilot may have been
tampered with.
• Orifice in bleed port No. 4A may be plugged.
• By-pass valve may be leaking.
• On pressure regulators like Type E5, the main valve
or pilot may be held open by foreign matter in seat.
To determine which valve leaks, follow these steps.
Close stop valve and 1/4 in. control pipe valve.
1. Remove bleed port bend so pilot will exhaust
to atmosphere.
2. Crack inlet stop valve. Steam will issue from
8B tee.
3. Release compression on adjusting spring to
see if pilot closes tight.
4. Open and close several times to wash seat.
Steam blowing back from bleed port means
main valve disk is held open by foreign matter.
Steam may wash the obstruction from the seat
if the valve is made to open wide. This can be
accomplished, even at light loads, if the control
point is beyond the outlet stop valve.
5. Reassemble bleed port bend and place
regulator in operation.
6. Slowly open and close outlet stop valve.
6
Type E5
