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Back Pressure & Safety Valves0 pages
• MILTON Ri
Valves
AD 4301
Effective 2/15/96
BACK PRESSURE & SAFETY VALVES
DESCRIPTION
Milton Roy safety valves prevent damage to metering pump systems due to excessive pressure. Undesirable pressure buildup
can result from valve closure or other obstructions to flow in the pump discharge piping. Models are available for flow rates to
2400 gph (90841/h). The "H" series is available for pressures up to 1500 psi (105 kg/cm2); the "L" series is available for pres-
sures up to 150 psi (10.5 kg/cm2).
Milton Roy back pressure valves provide added resistance over and above natural pipe system pressure for the metering
pump to work into. Most metering pumps require a discharge pressure at least 40 psi greater than inlet pressure to meter
accurately. The valve is designed to provide back pressure only while the pump is running. It will not provide leak tight seal-
ing with the pump shut off. If "anti-siphoning" is needed with the pump shut off, use of a positive shut off valve is recom-
mended. Models are available for flow rates to 2400 gph (90841/h). The "H" series is available with pressures to 200 psi (14
kg/cm2); the "L" series is available with pressures to 150 psi (10.5 kg/cm2).
tf'"H" SERIES f "H" SERIES
"H" SERIES FEATURES
Milton Roy "H" Series valves are available in Vi" and 1* with
either 316 SS or Alloy 20 wetted parts. Each valve is set at the
factory per your specification, but is also field adjustable.
• Externally adjustable pressure setting
• In-line servicing
• PTFE diaphragm isolates spring and other upper body
components from contact with process liquid
• Non-chattering, precision mechanism
• Compliance with Hydraulic Institute Standards, API 675
accessory requirements
• Low cost
• One year warranty
'H" SERIES PARTS & DIMENSIONS
-Cap
Upper Body
Adjusting Screw
— Spring
Seat Screw
Spring Seat
Union Nut
Ball Guide
Diaphragm
Back Pressure Seat
Gasket (1)
Inlet (2)
Ball Seat
Outlet
Lower Body (3)
Inlet
1 |
Safety Valve
Outlet (2)
NOTES:
1. Gasket is used on Vi" size valves only.
2. When using back pressure valves with set
pressures above 70 psi (4.9 kg/cm2), connec-
tions are reversed; i.e., the bottom port of the
valve becomes the inlet connection.
3. Lower body appearance varies with valve size.
4. A, B, and C dimensions may differ slightly for
some lower body materials of construction.
Back Pressure Valve
Valve Size
Inlet/Outlet
#•-14 ~
r-m/2
in
6.0
8.5
cm
15
22
B(4)
in
1.9
2.5
cm
C(4)
in
0.9
1.6
cm
Average Shipping
Weight (lbs.)
12
"
