12850-87
Avenue
Surrey, BC. Canada. V3W 3H9
Ph: 604-594-5404
Fx: 604-594-8845
www.singervalve.com
Installation (Cont.):
4. Install pressure gauges upstream and/or
downstream of valve as appropriate. This will
facilitate ease of setting the pilot system.
5. A strainer with a suitable basket should be installed
ahead of the valve to protect it from foreign
material.
6. Sufficient space should be provided around the
valve for disassembly.
7. Flush system of all foreign matter before installing
the valve.
8. Check direction of flow (inlet of valve is marked OR
an arrow on the side of body indicates flow
direction) and install the valve accordingly.
9.
VENT AIR FROM THE BONNET. After installation,
when the valve is pressurized, vent air from the
bonnet:
a) Valves installed in horizontal piping with bonnet up
(NO LIMIT SWITCH):
Sizes up to 2" where pilot connection is to the guide
bushing at the center of the valve do not require
venting (they vent automatically).
Sizes up to 2" with position indicator: use bleed-cock
on indicator.
Sizes 2-1/2" and larger, loosen pipe plug at the
center of the bonnet to bleed air. If equipped with
position indicator, use bleed-cock on indicator.
b) Valves installed in horizontal piping with bonnet up
(WITH LIMIT SWITCH): Refer to Drawing A0707A.
Use bleed screw (63) to vent air.
c) Valves installed in vertical pipe: The pilot connection
will be to the highest point on the bonnet if the
orientation and flow direction were specified on the
order. Some sizes vent automatically. Some sizes
are provided with a small screw to facilitate bleeding
(do not remove completely).
d) Valves that do not have the bleed screw and do not
bleed completely from existing connections must be
bled by loosening the bonnet bolts.
SERVICE SUGGESTIONS:
POSSIBLE CAUSE / REMEDY
FAILS TO OPEN
1. Insufficient inlet pressure. / Increase pressure
2. Pressure in the bonnet is not released:
• Isolating valves on pilot lines closed. - Open valves
• Pilot components not functioning. - Refer to specific
instructions on pilot components
• Foreign material in pilot system. - Clear obstruction
FAILS TO CLOSE
Lack of pressure in the bonnet due to:
• Pilot components not functioning. - Refer to specific
instructions on pilot components.
• Foreign material in pilot system.
• Ruptured diaphragm.
• Obstruction in the valve.
• Worn main valve disc.
PULSATIONS
• Air in the bonnet. - Vent air. Refer to "Installation
(9)" above.
• Improper adjustment to pilot components. - Refer to
specific instructions on pilot components.
• Valve oversized. A smaller valve in parallel may be
required.
MAINTENANCE:
The SINGER Model 106/206-PG requires a minimum of
maintenance. All parts are accessible for inspection
and repair without removing the valve from the line.
1. Close upstream and downstream isolating gate
valves.
2. Disconnect body and bonnet pilot lines.
3. Remove bonnet. If bonnet does not come free
readily, it can be pried loose with a small pry-bar.
4. Remove main valve assembly for inspection. Do
not remove seat ring unless inspection shows that it
is damaged.
5. Replace worn or defective parts and reassemble.
NOTE REGARDING FREEZING:
This valve does not drain completely when inlet and
outlet pipes are drained. Where freezing conditions are
expected, one of the following must be performed:
• Drain valve and pilot system completely.
• Add suitable anti-freeze to valve and pilot system
(Non-potable water service only).
• Provide insulation and/or heating to keep the valve
from freezing.
IOM 224A Page 2 of 2 June 2007
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