Nylon and PVC Valves Technical

Specifications

  • Operating Pressure :
  • Nylon Valves - 12 psi minimum, 145 psi maximum
  • PVC Valves - 12 psi minimum, 115 psi maximum
  • PVC Valve 6” - 12 psi minimum, 145 psi maximum Maximum water temperature:
  • 140° at maximum pressure Optional Control Functions:
  • Manual Electric Remote Control Pressure Reducing Pressure Sustaining Pressure Relief

Materials

  • Nuts, Bolts,Washers
  • Zinc coated steel/BS 5216 Nylon Valves only
  • Body, Bonnet and Seat: 30% Glass Reinforced Polyamide (GRP) PVC Valves only
  • Body: uPVC Spring
  • Stainless Steel AISI 302 Connections
  • Threaded - ANSI (NPT Female) Socket - IPS, PVC Standard Diaphragm
  • Standard - Natural Rubber Special - EPDM Rubber (Ethylene Proplylene Polymer) or Nitril (Butadiene Acrylonitrile)

Graphic Info

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Netafim Basic Valve Manual Operation

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The basic valve can be operated manually through the use of a 3-way selector. Selector options and their functions include:

(C) CLOSED Upstream pressure or pressure from an external source is applied to the control chamber. Initiated by the spring, the diaphragm is pressed down to close the valve drip-tight.

 

(A) AUTOMATIC The automatic port of the 3-way selector is connected to a solenoid, hydraulic relay or pilot, which controls the valve. The common port of the 3-way selector connects the control chamber to either A, O, or C, depending on the direction the selector is pointed.

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Valve Installation Tips

Threaded Valves

Use a few layers of Teflon tape or Teflon sealer compound on the adapter and tighten by hand. Use a wrench to tighten the adapter another half revolution.

Socket (Slip) Valve with PVC Pipe

Use the same procedure as when cementing PVC pipes. Mark the pipe first, then apply glue to the socket of the valve and the PVC pipe. Insert the pipe until reaching the mark and rotate a quarter turn. Hold the joint in place until the cement hardens.

Surface Installation

When installing the manifold above ground, the length of the manifold should be kept as short as possible (this eliminates the need for additional support). For longer lengths, a firm support under the horizontal pipes is recommended. Always install the valve with the bonnet exposed to the sun.

Subsurface Installation

For underground installations, use thrust blocks when needed, allow sufficient space and keep the area around the valve free from rough objects and stones. Cover the valve with clean soil - up to 24” is recommended for protection against heavy equipment. The controls for the valve, like the pilot, 3-way selector valve, should be positioned above ground. Be sure to mark the control tubing by color or number and put a protective poly or PVC tubing around the control tubing.

Diaphragm Replacement

Loosen bolts, remove old diaphragm and install new diaphragm. Tighten the bolts, applying even pressure in a diagonal pattern, until the diaphragm is firmly pressed between the body and the bonnet. Do not overtighten. If leakage occurs between the bonnet and valve, tighten until leakage stops