Threaded globe or angle; 3-way control loop. AC solenoid S-390-T-2W, or S-982 for DC latching
Sizes
1½" & 2" — globe or angle, threaded; Cv 43–47 on 1½", 54–60 on 2"
Best for
Sustains minimum upstream pressure and switches on an electric signal, so one valve prioritises the zone and controls system fill-up. It also relieves excess pressure, protecting the pump and the line. Composite hydro-efficient globe body with a single moving part and excellent low-flow regulation. Four pilot springs cover 3 to 150 psi
Rated 150 psi; operating range 7–150 psi; pilot spring 3–25 psi (green) and higher ranges
Connection
Threaded, flanged or Victaulic PVC adaptors (3", 4")
Sizes
1½", 2", 2½", 3", 4" (6" on some builds)
Best for
Sustains a minimum preset upstream (back) pressure and opens fully once line pressure rises above the setting — it prioritises pressure zones and controls how the system fills up, so remote or elevated plots do not starve while nearer laterals fill. Also prevents lines emptying, and holds backwash pressure on in-field filter stations. hYflow "Y" body for high flow at low loss. Available with solenoid control (-55)
Rated 150 psi; operating range 7–150 psi; pilot spring 3–25 psi (green)
Connection
Cast iron body; threaded or flanged
Sizes
1½", 2", 2½", 3", 4"
Best for
The metal 400 Series sustaining valve. In-line it sustains a minimum preset upstream pressure regardless of fluctuating flow or varying downstream pressure; installed as a relief or circulation valve it dumps line pressure above the preset. Position indicator assembly and flow stem available
Opens fast on a pressure surge to protect the line, then closes slowly to avoid causing a second surge. Use where pump start-up or sudden valve closure can spike the system
Rated 150 psi; operating range 7–150 psi; pilot spring 12–95 psi
Connection
Threaded or flanged; vacuum-sealed register
Sizes
1½", 2", 3", 4"
Best for
Mainline flow meter and pressure sustaining valve in one body — meters the water while holding minimum upstream pressure to a setpoint. The vacuum-sealed register keeps the dial readable after years outdoors
7–150 psi; spring ranges 7–30 psi (yellow), 14–65 psi (green), 30–90 psi (red); max water 140°F
Connection
Nylon threaded; all pilots and solenoids assemble on the bonnet — no tubes run to the valve body
Sizes
1½" & 2" — globe or angle
Best for
Holds minimum upstream pressure so priority zones stay fed, in the same drip-tight quick-reacting Series 80 body. Three colour-coded spring ranges from 7 to 90 psi. Order codes PSTH, or PSELTH for the pressure sustaining electric version
5–145 psi (low-pressure diaphragm), 10–145 psi (high-pressure diaphragm); max water 140°F
Sizes
3/4", 1", 1½", 2", 3" threaded
Best for
The Series 75 nylon body ordered in its pressure-sustaining configuration — holds minimum upstream pressure so higher or more distant zones do not starve. Same one-moving-part design and chemical resistance as the reducing version
Pressure Sustaining Normally Open — it sits open and only throttles when upstream pressure falls, which is exactly what a filter station needs. Holds enough pressure through a backflush that the flush actually cleans the screen, so cycles are shorter, filters come back faster and less water goes down the drain. Set the pilot to the sustaining pressure you want (e.g. 45 psi)
Typically set to open 10 psi above the working pressure
Sizes
2", 3", 4", 6", 8" — iron with threaded, flanged or grooved connection; bronze also available
Best for
Surge protection for the whole system. It sits fully closed while pressure is within range, then opens fast the instant pressure spikes — on pump start-up, on a sudden valve closure, or on a power cut. Netafim call it the universal solution for protecting a system, and it is the cheapest insurance against a split mainline
To 145 psi (10 bar); over 6" rated to 232 psi (16 bar)
Sizes
1"–16" — angle and straight
Best for
Sustains minimum upstream pressure so priority zones and elevated blocks stay fed. Also available as a combined PR/PS valve that does both jobs in one body — which saves fitting two valves in series
Need pricing on any of these pressure sustaining valves? Send the model and quantity, or just describe the block, and we'll come back with wholesale pricing within one business day. Everything on this page is sold to production nurseries, greenhouses and education programs.
