Model RSQ
Round Star RSQ series brass solenoid valve, 2/2-way pilot operated and normally closed, built to close gently so the line is not hammered. Low coil power: 10-12 VA on AC, 6.5-10 W on DC.
Prices on request. Contact us for availability and quotations.
The RSQ series is a two-way, normally closed, pilot operated solenoid valve. Line pressure across the diaphragm does the work of opening and closing the main orifice; the coil only moves the pilot. The series is built for a controlled closing rate, which is what limits water hammer - the pressure surge that follows an abrupt shut-off on a long or rigid pipe run and is the usual cause of cracked fittings and split hoses on booster and irrigation mains.
Coil consumption is low for the size of valve: 10-12 VA on AC 220 V, AC 110 V or AC 24 V, 9-10 W on DC 24 V and 6.5 W on DC 12 V, which suits solar and battery-backed control panels and long banks of valves on one transformer. Bodies are brass HPb59-1A or SS304, seals NBR as standard with EPDM and Viton offered, and an LED connector is listed as an option.
Sizes run G3/8" (RSQ-10) to G2" (RSQ-50), orifices 13.5 to 48.5 mm, Cv 3.5 to 46. Being pilot operated, the valve needs a minimum differential of 0.3 bar to open. Maximum pressure depends on size, medium and coil supply: up to 16 bar on air and 12 bar on water at G3/8" to G1" with AC 220 V or DC 24 V, dropping to 12 and 10 bar at G1.1/4" to G2", and 8 bar throughout on AC 24 V or DC 12 V.
When ordering, state size, body material, thread form, seal and coil voltage, and check the available differential at the valve - below 0.3 bar this series will not open and a semi-direct acting valve is the correct choice instead.
| Type | 2/2-way, pilot operated, normally closed, with controlled closing to limit water hammer |
|---|---|
| Body Material | Brass HPb59-1A or stainless steel SS304 |
| Seal Material | NBR (-10 to +80 °C) standard; EPDM (-20 to +130 °C) or Viton (-15 to +120 °C) optional |
| Size Range | G3/8" to G2" (RSQ-10 to RSQ-50); orifice 13.5, 18, 24, 31, 39 and 48.5 mm |
| Pressure Range | Minimum differential 0.3 bar. Maximum depends on size, medium and coil supply: on AC 220 V / DC 24 V, 0.3-16 bar on air and 0.3-12 bar on liquid or water up to G1", and 0.3-12 bar on air and 0.3-10 bar on liquid at G1.1/4"-G2". On AC 24 V / DC 12 V, 0.3-8 bar in all sizes |
| Flow Coefficient (Cv) | 3.5 at G3/8"-G1/2", 7.6 at G3/4", 12 at G1", 20 at G1.1/4", 28 at G1.1/2", 46 at G2" |
| Medium | Water, liquid, air and light oil of viscosity up to 20 cSt |
| Ambient Temperature | -20 to +65 °C |
| Coil Power | AC 220 V / AC 110 V / AC 24 V: 10-12 VA. DC 24 V: 9-10 W. DC 12 V: 6.5 W |
| Connection | G (parallel) or NPT female thread |
| Weight | Brass 0.5 kg at G3/8"-G1/2" to 4.3 kg at G2"; SS304 0.45 kg to 3.9 kg |
