Range of Valves

The GEORGE FISCHER range of valves are available in PVC-U, PVC-C, ABS as well as PP-H, PP-n and PVDF. A full range of valves include:

  • diaphragm valves,
  • ball valves,
  • 3-way valves,
  • butterfly valves and
  • non-return valves in ball-check and wafer-check styles

Also included in the GF Valve Range are:

  • 3-way ball Type 543 in T-port or L-Port configuration for liquid flow diversion;
  • New design Type 561/562 cone check valves and Type 591/595 vent valves for vertical installations;
  • Wafer Type 369 Swing check valves for horizontal installations;
  • Metering Ball Valve Type 523 for linear flow control in dosing applications.


Chemical process industry; life science; microelectronics; measurement & control; water treatment; ship building etc.

514-519 Diaphragm Valves

Wherever you are dealing with the control and metering of hazardous substances, the new diaphragm valve from GEORGE FISCHER PIPING SYSTEMS is a real life saver, because this is the safest diaphragm valve available. Instead of the usual four...

546 Ball Valves

The ball valve Type 546 is yet another innovative product developed by GEORGE FISCHER PIPING SYSTEMS and distributed by Quadrant Chemplast; it comprises extensive experience and the latest technology. A broad spectrum of product features...

567/568 Butterfly Valves

Quadrant Chemplast presents the new GEORGE FISCHER 567/568 type series of butterfly valves with a comprehensive range of products and a multitude of interesting combination possibilities. We can offer you, for example, manual valves with...

Pressure Reducing Valves

Included are pressure relief valves, pressure regulating valves and pressure retaining valves in PVC-U, Polypropylene and PVDF in sizes from DN10 to DN100. Pressure ranges from 0.5 to 10 Bar. Also available are gauge guards, ventilating...

  • keyboard_arrow_downPlastic Pipe Sizes:


    Plastic pipe dimensions are, by convention, specified by the outside diameter, usually denoted by e. This may be supplemented by stating the nominal inside diameter or DN. Sometimes the pipe wall thickness is specified by the SDR or Standard Dimension Ratio.


    SDR = d divided by e.

    Where d = the outside diameter (mm)

    Where e = the pipe wall thickness (mm)

  • keyboard_arrow_downWhat Pipe Size?


    The pipe size can be calculated as follows:

    di = 18.8 √Q1 ÷  v


    di = Inside pipe diameter (mm)

    Q1 = Flowrate in m3/h

    v = Flow velocity, usually 0.5 to 1.0 m/s for suction lines


    1.0 to 3.0 m/s for discharge lines.

  • keyboard_arrow_downPressure loss in straight pipe:


    A rough calculation of pressure loss in straight length plastic pipe can be done using,

    Δ Pr = λ × (L ÷ di) × (ρ ÷ 2.102) × v2



    Δ Pr = Pressure loss (bar)

    λ = Pipe friction factor

    L = Length of straight pipe (m)

    di = Inside pipe diameter

    ρ = Liquid density (kg/m3)

    v = Flow velocity (m/s)


    For smooth bore plastic pipe: λ = 0.02