Resilient Seated Gripper Valves

Derwent Resilient Seated Gripper Valves for PE, made in conjunction with AFC, are manufactured to AS/NZS 2638.2. The Gate Valves are applicable for water and waste water applications. Valves are available in both Anticlockwise and Clockwise configuration. Valves are supplied with Key Cap as standard,  ISO mounting plate for fitting, gearbox or actuators are available via special order.

Features & Configurations:
 

  • Material: Ductile Iron Body and Bonnet to AS 1831
     

  • Wedge:  Ductile Iron AS 1831, fully encapsulated
    (Vulcanized) EPDM
    Rubber to AS1646 and AS681.1.
    The wedge is designed with abrasion resistant nylon
    guides
    which reduce the required opening 
    and closing torque through smooth operation

     

  • Stem:  431 Stainless Steel to ASTM A276,
    providing excellent
    corrosion and strength,
    reducing moving parts
     

  • Bolts:  316 Stainless Steel to ASTM A276, hot melt
    encapsulated
    for superior corrosion resistance in
    harsh environments

     

  • Coating: Fusion Bonded Epoxy coated to  AS/NZS 4158
    provides the valve
    excellent corrosion protection

Applications:

The Derwent Gripper Valves are for use in Potable Water, Waste Water, Fire, Irrigation, Water Circulation and Heating and Cooling applications and are suitable for both above and below ground installation.

Technical Information:


Size range:

  • DN 80 - 300

  • Note: 125 and 180 currently available, other sizes mid-late 2021

    
Allowable Operating Pressure: 

  • 1600 kPa; 1.6 Mpa


Maximum Test Pressure (Shell):  

  • 2400 kPa, 2.4 Mpa


Maximum Temperature:  40 Deg C


Certification:    SAI Global  


Watermark Lic. No.    25890 
Standards Mark Lic. No. 25890

WSAA: PA 1511

Installation:

  1. Ensure Valve is correct size for the host pipe.

  2. If using PE pipes with thin walls rated (> SDR 21) and low internal pressure, we recommend the use of a support liner.

  3. Ensure pipe has a chamfered end prior to fitting to reduce the chance of seal damage and aid in inserting the pipe. (Refer to pipe manufacturers recommended chamfer size).

  4. Apply an approved pipe lubricant to the pipe end to assist with fitting.

  5. Push the pipe end into the end of the socket.(Refer to insert depth on the back)

  6. Tighten the locking ring bolts evenly around the fitting ensuring the ring is tight on the stop bushes.

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