Latching / Bi Stable Solenoid Valves

Latching / Bi Stable Solenoid Valves.

Bi stable latching solenoid valves are typically available in brass, stainless steel or plastic with 2/2 or 3/2 way function to suit most applications, the solenoid valve picture here shows our LAD612 brass miniature direct acting bi-stable solenoid valve, however we also offer brass latching solenoid valve series LAD1550 or stainless steel LADS1550 pressure rated 0 to 3.5 bar available from 3/8 through to 2" BSP ports with many other latching bi-stable solenoid valves available from our online store here.

Latching solenoid valves utilise a semi-permanent magnet latching system that can keep the bistable solenoid valve in an open position without the need for continuous electrical power supply. The latching solenoid valve can be changed from the open back to the closed position with a short DC direct current electrical pulse.

For example: a typical 6 or 9 volt bi stable solenoid valve will in a closed position without electrical power. To change the solenoid valve position to the open position requires only a short millisecond electrical voltage, which in turn energises the internal semi-permanent magnet to open and keep open the solenoid valve without the need for additional electrical supply. To return the latching solenoid valve back to the closed position a short millisecond DC voltage needs to be applied with reversed polarity thus cancelling any magnetic force stored by the semi-permanent magnet and allowing the solenoid valve to close.

This is an ideal low power, energy saving and heat saving way to control a solenoid valve and is especially useful in remote areas where power is restricted to battery supply.

A great example of this are public toilet cistern water refill systems and water flushing systems that can offer months, sometimes years of reliable ON/OFF water control via an infra-red sensor and a simple 9 volt battery. In fact, this has become such a large market for energy saving devices that latching solenoid valves have been specifically designed to fit directly onto the most common 15mm copper pipe without the need for additional fittings or adaptors.   

The other advantage of latching  / bi stable solenoid valves is reduced coil heat generation. All solenoid valve coils generate heat when energised a bit like a light bulb, even a low power 6 watt light bulb or solenoid valve coil will generate heat if powered or energised for a period of time. The more powerful the coil i.e. the higher the wattage, the more electrical energy is used and converted into heat. Heat generated by solenoid valves in some applications is bad news as some chemicals react to heat and in hard water areas will produce lime scale build up and cause a solenoid valve to fail. A latching or bi-stable solenoid valve coil is only energised for a very short time and is highly unlikely to become hot unless there is an electrical system failure or the wrong voltage has been applied.

With this in mind and an ever-growing demand for low energy and energy saving solenoid process valves, manufacturers have developed a wide range of solenoid valves to suit many different applications using this energy saving technology.

Find, read about and buy latching solenoid valves here.

	Miniature plastic nylon latching solenoid valve Function: 2/2 Way Body: Nylon WRAS approved Operation: pressure assisted diaphragm Pressure: 0.2 to 10 bar Port: 1/8",1/4",3/8",1/2" or 3/4" BSP port or 15mm Push Fit. Operating voltage: 6vdc to 9vDC
	Miniature brass latching solenoid valves Function: 2/2 way latching Operation: direct acting Pressure: 0 to 42 bar Port: 1/8" or 1/4" BSP or NPT thread Operating voltage: 12vdc or 24vdc
	Miniature 316 stainless steel latching solenoid valve Function: 2/2 Way bi-stable Operation: direct acting Pressure: 0 to 42 bar Port: 1/8" or 1/4" BSP or NPT thread. Operating voltage: 12vdc or 24vdc
	Miniature brass latching solenoid valve Function: 2/2 way latching Operation: direct acting Pressure: 0 to 3.5 bar Port: 1/8",1/4",3/8" or 1/2" BSP or NPT thread. Operating voltage: 12vdc or 24vdc
	Miniature stainless steel latching solenoid valve Function: 2/2 Way latching Operation: Direct acting Pressure Range: 0 to 3.5 bar Port Sizes: 1/8",1/4",3/8" or 1/2" BSP or NPT thread. Operating voltage: 12vdc or 24vdc
	Brass latching solenoid valve Function: 2/2 way bi-stable Operation: direct acting Pressure: 0 to 3.5 bar Port: 3/8",1/2",3/4",1",11/4",11/2" or 2" BSP or NPT. Operating voltage: 12vdc or 24vdc
	316 stainless steel latching solenoid valves Function: 2/2 way bi-stable Operation: direct acting Pressure: 0 to 3.5 bar Port: 3/8",1/2",3/4",1",11/4",11/2" or 2" BSP or NPT thread Operating voltage: 12vdc or 24vdc
	Delrin latching solenoid valves Function: 2/2 way bi-stable Operation: pressure assisted diaphragm Pressure: 0.5 to 10 bar Port: 3/8",1/2",3/4",1",11/4" or 11/2"BSP or NPT thread Operating voltage: 12vdc or 24vdc
	High pressure brass latching solenoid valves Function: 2/2 way bi-stable Operation: pressure assisted Pressure: 1 to 300 bar Port: 1/8" or 1/4" BSP or NPT thread Operating voltage: 12vdc or 24vdc As used for automated Fire Fighting and fire extinguishing systems
	High pressure steam brass latching solenoid valves Function: 2/2 way latching Operation: pressure assisted Pressure: 0.5 to 20 bar (Option for 40, 80 and 120 Bar) Port: 3/8",1/2",3/4",1",11/4",11/2" and 2" BSP or NPT port. Operating voltage: 12vdc or 24vdc