16633 Foltz Parkway
●
Strongsville, OH 44149 USA Telephone: +1 (440) 572-1500
●
Fax: +1 (440) 238-8828
www.clark-reliance.com
●
When mounting Steel Water Gage Valves, make sure they are mounted in exact alignment, especially when tubular glass
is used during Boil-out procedures. Any angular or offset misalignment of the valves will strain the tubular glass and may
cause early failure. When installing the armored type gage glass, any misalignment could cause a leak from the flanged
connection that may result in damage to the valve or gage glass.
When mounting the boil-out tubular glass and valves in
vertical mounting applications, the overall length of the gage should be 1 ¼” less than the valve centers.
When mounting water gage valves and a gage glass directly to the vessel, the valve centers must be secured to prevent
movement which could result in leakage around the gage glass flanged connection. Use of a Tie Bar with U-bolts, water
column, or Standpipe to keep the water gage valve centers from expanding is recommended.
Installing the valves:
The valve set contains two valves: an upper and a lower. The lower valve has a ½” FSW/FNPT drain connection and
must be installed on the lower connection to guarantee proper operation of the valves and gage glass.
Reliance SG777 Series steel water gage valves typically are furnished with three types of vessel connections:
1) 1 ½” Female Socket Weld
2) ¾” Male NPT
3) ¾” Male Socket Weld
4) Other connections are available on request
If furnished with male NPT connections, coat the threads with a pipe joint compound such as TYTE-UNYTE® Thread
Sealing Compound or equal. Assemble the upper and lower valves on to the vessel connections making sure there is
no angular or offset misalignment of the valves. Note that the valves should be seal welded to the connections. This is
normally recommended for installations that operate over 900 PSIG. Welding is to be done by ASME Section IX
qualified welders and with approved welding procedures and Section II approved welding materials.
If the valves are furnished with female socket weld connections, care must be taken to orient the valves so there is no
angular or offset misalignment. Welding is to be done by ASME Section IX qualified welders and with approved
welding procedures and Section II approved welding materials.
If the valves are furnished with male socket weld connections, care must be taken to orient the valves so there is no
angular or offset misalignment. Welding is to be done by ASME Section IX qualified welders and with approved
welding procedures and Section II approved welding materials.
Attaching the Gage Glass
Lubricate the bolting with high temperature nickel based lubricant (Molycote “G” or equal). When using the standard ½”-
2500# RTJ flanges, place the R-13 Oval Ring between the upper and lower flanges. Using a calibrated torque wrench,
torque the nuts to 85 ft-lbs in the proper sequence.
