The definition of a solenoid valve is an electro-mechanical valve that is commonly employed to control the flow of liquid or gas. There are various solenoid valve types, but the main variants are either pilot operated or direct acting. Pilot operated valves, the most widely used, utilize system line pressure to open and close the main orifice in the valve body. 

Solenoid valves are classified according to their functions:

Water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low temperature
solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, liquid solenoid valve, micro solenoid valve, pulse solenoid valve, hydraulic solenoid valve often Open solenoid valve, oil solenoid valve, DC solenoid valve, high pressure solenoid valve, explosion-proof solenoid valve, etc.

How it works

There is a closed cavity in the solenoid valve, and there are through holes in different
positions. Each hole is connected to a different oil pipe. There is a piston in the middle of the cavity, and two electromagnets on both sides. On the other hand, different oil discharge holes are opened or closed by controlling the movement of the valve body, while the oil inlet hole is normally open, the hydraulic oil will enter different oil discharge pipes, and then the piston of the cylinder is pushed by the pressure of the oil, and the piston again Drive the piston rod, and the piston rod drives the mechanical device. In this way, the mechanical movement is controlled by controlling the electric current on and off of the electromagnet.

Notes on installation

1. When installing, pay attention that the arrow on the valve body should be consistent
 with the flow direction of the medium. Do not install in places where there is direct dripping or splashing of water. The solenoid valve should be installed vertically upward;
2. The solenoid valve should be guaranteed to work normally within the fluctuation range of 15%-10% of the rated voltage;
3. After the solenoid valve is installed, there must be no reverse pressure difference in the pipeline. And it needs to be energized several times to make it suitable for temperature before it can be officially put into use;
4. The pipeline should be thoroughly cleaned before the solenoid valve is installed. The incoming medium should be free of impurities. Filter before the valve;
5. When the solenoid valve fails or is cleaned, in order to ensure the continuous operation of the system, a bypass device should be installed.


Woodward, Inc. is an American designer, manufacturer, and service provider of control systems and control system components (e.g. fuel pumps, engine controls, actuators, air valves, fuel nozzles, and electronics) for aircraft engines, industrial engines and turbines, power generation and mobile industrial equipment.

Diselmart supply OEM quality fuel shutdown Woodward solenoid valve(also called fuel cut off solenoid valve). Which is widely used in many engine and machines including excavator, loaders, skid steers. Woodward fuel shutoff solenoids have two kinds of solenoids, single-coil solenoids and dual-coil solenoids.

Single-coil solenoids are 1000S series, 1510S series.

1000S series

Heavy-duty locks designed for side-load resistance in hydraulic or mechanical applications. Plunger can withstand 1500 pounds of side load in the de-energized position.

  • Single coil construction for simple electrical interface
  • Hardened, stainless steel pin resists high shear load and increases fatigue resistance
  • Nickel plated plunger ensures smooth, reliable operation, as well as corrosion and wear resistance
  • Protective brass liner plunger bore provides longer operating life
  • Rugged construction allows for operation under the most severe temperature and vibration conditions
  • Easy installation—no brackets or linkages necessary

Example models: SA-4971, SA-4972

1510S series

Typically designed for continuous duty, with single coil performing both the pull and hold function for the solenoid.

  • Continuous duty operation
  • Hard chrome plated plunger for smooth, reliable, wear-resistant operation
  • Brass liner plunger bore for long life
  • Corrosion resistant plated steel housing and mounting base/flange
  • Potted coil construction
  • Variety of options for mounting bases/flanges, plungers, terminations, boots, and springs
  • 100% inspected and factory tested

Example models: SA-4741

Dual-coil solenoids are Wooward 1500 series, Wooward 1700 series, Wooward 1750 push series, Wooward 1750 series, Wooward 2000 series, Wooward 2370 series.

1500 series

Models 1502, 1502ES, 1503ES, 1504 dual coil solenoids Pull Force Range: 10-12 lbs (44-53 N) Hold Force Range: 19-28 lbs (85-125 N)

1700 series

Models 1751, 1751ES, 1753 & 1753ES dual coil solenoids Pull Force Range: 19-25 lbs (85-111 N) Hold Force Range: 38-43 lbs (169-191 N)

2000 series

Models 2001, 2001ES, 2003, 2003ES dual coil solenoids Pull Force Range: 21-29 lbs (93-129 N) Hold Force Range: 41-51 lbs (182-227 N)

2370 series

Models 2370 and 2370ES dual coil solenoids Pull Force Range: 37-39 lbs (165-173 N) Hold Force Range: 88-92 lbs (391-409 N)


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