Armstrong GD-10 Installation And Maintenance Instructions

Typical Piping For Air
Liquid
Drainer
Typical Piping For Steam
This bulletin should be used by experienced personnel as a guide to the installation of the Model GD-10, GD-10N and
GD-10F Pressure Reducing Valve. Selection or installation of equipment should always be accompanied by competent
technical assistance. You are encouraged to contact Armstrong International, Inc. or its local representative for
additional information.
Improper adjustment of the pressure reducing valve may cause hunting, scale problems, etc., and damage to the valve
itself. Adjust the valve as follows:
1. Close the gate valves before and after the pressure
reducing valve. Open the globe valve in the bypass line
and blow down the inlet piping. Adjust the opening of
the bypass valve so that the safety valve if used does
not blow. After blowing the system down, close the
bypass valve.
Model GD-10, GD-10N and GD-10F
Pressure Reducing Valve
Installation and Maintenance Instructions
Armstrong GD-10, 10F, 10N
Pressure Reducing Valve
Strainer
Globe
Valve
Strainer
GD-6
Minimum of 10 inlet
Pipe Diameters from
PRV to First Turn
TVS Trap
Start-Up and Adjusting Procedures
By-Pass
Minimum of 10 outlet
Pipe Diameters from
Last Valve or Fitting
By-Pass
Minimum of 20 outlet
Pipe Diameters from
PRV to First Turn
Note: Safety Relief Valve to be set at
10 psi higher or 90% higher than
the downstream pressure, whichever
is greater.
2. Loosen the lock nut and adjusting screw to relieve the
adjusting spring.
3. Slowly open the inlet side gate valve to the fully open
position, and partially open the outlet valve so only a
small amount of fluid can pass.
Bulletin No. AY-741-A
Safety Relief
Valve