Leslie Controls GP Pressure reducing valve - Manual (Page 2)

Page 2
SECTION I — INSTALLATION
Piping Details
Recommended Straight Run Piping Dimensions inlet and
outlet — All Types and Pressures
Valve Position
Install valve upright in the highest horizontal line of piping, in
an accessible location and with the arrow on the side of the
body in the direction of fluid flow.
NOTE: STOP VALVE IS NECESSARY WHEN SENSING LINE IS
LOCATED DOWN STREAM OF OUTLET STOP VALVE.
Problem Preventing Procedure
1. Provide space above, below and around the valve for
removal of parts during maintenance.
2. Blow or flush out the pipe lines thoroughly before
installing the valve.
3. Remove raised faces of iron or steel line flanges to
which bronze valves are to be bolted. Make outside
diameter of gaskets the same as flanges; inside diam-
eter is 1/4” larger than the bore of the flanges.
4. Do not use red lead or cement in making up joints. In
threaded valves use pipe compound sparingly on male
threads only.
5. STRAINER — Protect the valve and following equip-
ment with a Self-Cleaning Strainer.
6. Install stop valves nd gages in inlet and outlet lines to
provide a means for checking adjustment and opera-
tion of the equipment.
7. In steam service, insulate all piping before and after the
valve to minimize condensation. Provide proper inlet
drainage to prevent water hammer or erosion in the
equipment.
8. Adhere to good piping practice. Install a bypass
around the valve.
Control Pipe — All Pressures
Connect 3/8” control pipe )having I.D. equivalent to 40 sched-
ule pipe) with stop valve, union and pressure gage (as shown
in Figures 1 and 2) from threaded connection in main body of
valve to section of outlet piping before outlet stop valve.
Slop control pipe downward to outlet piping to prevent
water pockets.
Important — Make control pipe connection in expanded out-
let piping at a point at least 24” downstream from the end of
the expander and not within 18” to 24” of the outlet stop
valve, any elbow or other flow direction changing fitting.
Control pipe length should be held to approximately 3’.
Connect control pipe to side of outlet pipe if necessary to
obtain proper slope.
Recommended outlet piping for valves controlling compress-
ible fluids at values of 25% or less of inlet pressure;
Expand outlet pipe (E Dimension) to twice the valve size.
Use tapered expander — 15°/20° on included angle.
Note: Further expansion of low pressure outlet piping
beyond the outlet stop valve has no effect on operation of
this valve.
Figures 1 and 2
Recommended Valve Installations
DIMENSIONS
VALVE SIZE
D E
1/2” to 1-1/2” 1’6” to 5’ 4’ to 5’
2” to 4” 3’ to 5’ 4’ to 8’
Operating medium from air loader or sensing element
Operating medium from air loader or sensing element
Fig. 1 — For controlled pressures above 25%
of Inlet pressure (Compressible Fluid).
Fig. 2 — For controlled pressures of 25% or less
of Inlet pressure (Compressible Fluid).
Top view of Pressure Reducing Station showing
Bypass arrangement.
* Expand line after stop valve to cross sectional area
as required for steam flow.