Netafim Pressure Sustaining Valve, Series 80 3-Way Angle, 1-1/2 in

Netafim Pressure Sustaining Valve Holding the Line Upstream

A pressure reducing valve looks after what is downstream; this one protects everything upstream. It holds a minimum pressure on the supply side and only opens far enough to pass the surplus. The pilot on the bonnet watches inlet pressure. When the line climbs above the set point the main diaphragm lifts, and when the supply sags the valve closes back to hold it. It is fully hydraulic, item 71610-019788, with no solenoid to wire. The 1-1/2 in angle body carries 0.25 to 110 GPM and works between 7 and 150 psi, with water up to 140°F. Open, it adds very little loss, about 0.2 psi at 20 GPM and 6.5 psi at 130 GPM. Body, bonnet and seat are glass-reinforced polyamide, with 304 stainless fasteners and a 302 stainless spring. It measures about 3-1/2 x 6-1/2 x 6-13/16 in and weighs 1.8 lb. Pilot springs are colour coded by range: yellow 7-30 psi, green 14-65 psi, red 30-90 psi.

Where a 3-Way Pressure Sustaining Valve Earns Its Spot

The classic job is keeping enough pressure behind a filter station so it can backflush while the zones keep running. Another is stopping a pump from running out on its curve when a big, low zone opens and drags the whole main down. On sloping sites it gives priority to the higher blocks, because the low block cannot steal their water. Install it after the item it protects, with the angle body turning the flow off a riser or manifold. Setup takes only a few minutes. Open the supply slowly, then set the pilot against a gauge on the inlet side. Once the reading holds, leave the pilot alone and let it regulate. A 3-way pressure sustaining valve can mount vertically or horizontally, which helps in a cramped manifold. It is not an on-off zone valve, so scheduling still needs a separate electric valve or controller. Recheck the set point when pumps, filters or zone layouts change, since each of those moves the pressure it has to hold.

Key Features

• Pressure sustaining pilot: Holds a minimum upstream pressure and passes only the surplus flow downstream.
• Bonnet-mounted pilot: Pilot and controls sit on the bonnet, with no tubing connected to the valve body.
• Angle body: Turns the flow off a riser or manifold without an extra elbow.
• 0.25-110 GPM range: Covers single drip blocks through large zones on one 1-1/2 in valve.
• Colour-coded pilot springs: Yellow, green and red springs span set points from 7 to 90 psi.
• Vertical or horizontal mounting: Sits upright or on its side to suit a tight filter or pump manifold.

Technical Specifications