Back Pressure & Safety Valves
4Pages

{{requestButtons}}

Catalog excerpts

Back Pressure & Safety Valves - 1

BACK PRESSURE & SAFETY VALVES 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- 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). 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 'H" SERIES PARTS & DIMENSIONS Upper Body Adjusting Screw Seat Screw Spring Seat Ball Guide Back Pressure Seat Ball Seat Safety Valve 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 Average Shipping

Open the catalog to page 1
Back Pressure & Safety Valves - 2

"H" SERIES TYPICAL IMSTALLATIOIU __jc^Valve XPampener JH" SERIES PERFORMANCE CURVES Back Pressure "H" Series safety valves must discharge to atmospheric pres- sure. Also, use of a pulsation dampener in conjunction with a back pressure valve will result in extended valve life (cycling with each pump stroke is eliminated). Maximum allowable pressure downstream of back pressure valve is 100 psi. Other materials are available for special applications.

Open the catalog to page 2
Back Pressure & Safety Valves - 3

Milton Roy "L" Series valves are available in yk" through 2". Ma- terials of construction include PVC, CPVC, PP, PVDF, PTFE, 316 SS, Alloy 20, and hastelloy C276. Valves are field adjustable, and • High reliability / low cost • Robust machined construction • Vulcanized PFA/EPDM diaphragm • Externally adjustable from 0 to 150 psi standard • Ventable to suction line • Wide range of materials • Tamper resistant adjustment screw L" SERIES PARTS & DIMENSIONS and Hastelloy C276 valves with 2. Inlet and outlet port are inter- changeable on safety valves. Inlet and outlet ports are marked with...

Open the catalog to page 3
Back Pressure & Safety Valves - 4

"L" SERIES TYPICAL INSTALLATION ■L" SERIES PERFORMANCE CURVES It is rcommended that "L" Series safety valves discharge to at- mospheric pressure. Also, use of a pulsation dampener in con- junction with a back pressure valve will result in extended valve life (cycling with each pump stroke is eliminated). Maxi- mum allowable pressure downstream of back pressure valve should not exceed valve rated pressure. Other materials are available for special applications. 'L" SERIES PRODUCT CODE B = Back Press. Valve * 316 SS and Alloy 20 are not available in Vi" and 1" sizes. Order from the "H" Series...

Open the catalog to page 4

All Milton Roy catalogs and technical brochures

  1. Proteus

    8 Pages

  2. POWEROYAL®

    8 Pages

  3. Primeroyal

    8 Pages

  4. mROY

    7 Pages

  5. SC5200

    2 Pages

  6. Milroyal C

    12 Pages

  7. Milroyal B

    12 Pages

  8. RoyPak

    2 Pages

Archived catalogs