5
TROUBLE SHOOTING
FAILURE TO OPEN OR SAGGING DELIV-
ERY PRESSURE
1. Adjusting spring on pilot may have been tampered
with.
2. Initial pressure may be down due to partially closed
supply valve, clogged strainer or other obstruction.
3. Orifice in No. 5A restriction elbow may be plugged.
No. 4A bleedport fitting may have been omitted and
an open coupling substituted.
4. Control pipe may be plugged. Most likely points of
obstruction are at shutoff valve and entrance to
delivery main.
5. Main diaphragm may be broken. Test with air or
water before dismantling.
FAILURE TO CLOSE OR OVER-RIDING
DELIVERY PRESSURE
1. Adjusting spring on pilot may have been tampered
with.
2. Orifice in bleedport No. 4A may be plugged.
3. By-pass valve may be leaking.
4. On pressure regulators like the E5, the main valve or
pilot may be held open by foreign matter in seat. To
determine which valve leaks, first close stop valve
and 1/4" control pipe valve. Then remove bleedport
bend so pilot will exhaust to atmosphere. Crack
inlet stop valve. Steam will issue from No. 8B tee.
Release compression on adjusting spring to see if
pilot closes tight. Open and close several times to
wash seat. Steam blowing back from bleedport
means main valve disc is held open by foreign mat-
ter. 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. Reassemble
bleedport bend and place regulator in operation.
Then, slowly open and close outlet stop valve.
MAINTENANCE
INSPECTION
Under normal conditions, complete dismantling at
regular intervals is not recommended. A valve kept
relatively free of dirt will function for years with min-
imum attention.
After the first few days of operation and twice a
year, the following should be checked.
1. Inspect for dirt collected at bleedport No. 4A and
restriction elbow No. 5A.
2. Inspect all joints for leakage. Keep bolts tight.
Never allow a leak to persist.
DISMANTLING MAIN VALVE
Connect a source of air or water pressure which
can be adjusted by hand to the No. 5A restriction
elbow. See Figure 5. Apply pressure to valve so
diaphragm will push on stem preventing it from
turning while removing stem nuts. Usually 50 to 60
psi will suffice. Use penetrating oil on the threads.
See Figure 5.
FIGURE 5
