The core tube contains and guides the core. When the coil is not energized, springs will hold the core in its normal position. The core's movement will make or break the seals that control the movement of the fluid. The core or plunger is the magnetic component that moves when the solenoid is energized. armature tube, plunger tube, solenoid valve tube, sleeve, guide assembly) Solenoid coil (with magnetic return path).Solenoid valve designs have many variations and challenges.Ĭommon components of a solenoid valve: The coil slips over the core tube a retaining clip engages the depression near the closed end of the core tube and holds the coil on the core tube. The core tube encloses the plugnut, the core spring, and the core. Non-magnetic core tubes are used to isolate the fluid from the coil. Should the pressure at the output rise above that of the input, the valve would open regardless of the state of the solenoid and pilot valve.Įxample core tubes.
This is why pilot-operated valves will not work without a sufficient pressure differential between input and output, the "muscle" needs to be strong enough to push back against the diaphragm and open it. In this way, a pilot-operated solenoid valve can be conceptualized as two valves working together: a direct-acting solenoid valve which functions as the "brain" to direct the "muscle" of a much more powerful main valve which gets actuated pneumatically or hydraulically. Supplying an electric current to the solenoid pushes the pin into a closed position, blocking passage D, allowing water to accumulate in cavity C, and ultimately closing diaphragm B. In that case, the pin is naturally held open by a spring, passage D is open, and cavity C is never able to fill up enough, pushing open diaphragm B and allowing unobstructed flow. This process is the opposite for a normally open pilot-operated valve. When the solenoid is deactivated and passage D is closed, water once again accumulates in cavity C, closing the diaphragm once the downward force exerted is great enough. With the downward force of cavity C now less than the upward force of inlet A, the diaphragm is pushed upward, thus opening the valve. Less water in cavity C means the pressure on that side of the diaphragm drops, proportionately dropping the force too. In a normally closed valve, supplying an electric current to the solenoid will raise the pin via magnetic force, and the water in cavity C drains out through passage D faster than the pinhole can refill it. An approximate relationship between the required solenoid force F s, the fluid pressure P, and the orifice area A for a direct acting solenoid valve is: F s = P ∗ A = P π d 2 / 4, the force from cavity C pushing downward is greater than the force from inlet A pushing upward, and the diaphragm remains closed.ĭiaphragm B will stay closed as long as small drain passage D remains blocked by a pin, which is controlled by solenoid E. A small solenoid can generate a limited force. Solenoid valves are also characterized by how they operate. That's why H.A.K Pneumatic offers you your money back on any blue air pneumatic purchases.The solenoid valve (small black box at the top of the photo) with input air line (small green tube) used to actuate a larger rack and pinion actuator (gray box) which controls the water pipe valve. ⭐⭐ ⭐ ⭐ ⭐ 100% CUSTOMER SATISFACTION GUARANTEED ✔️ If you are not satisfied, we're not satisfied.The coil protection level is IP65, and the power connection mode is lead-out type and junction box type. NORMALLY CLOSED ✔️ This is a normally close type electric solenoid valve, power on to open it and power off to close it.PRECAUTIONS FOR USE ✔️ Better for intermittent short-time work, single continuous power-on time is better to be less than 30 minutes, which will extend the valve’s life.HIGH QUALITY ✔️ Valve body is made of brass material, with long-serving life, diaphragm seal, sensitive movement, the high-quality brass valve body would hold a press up MAX 7 KG/cm2.
In addition used with pipelines in Water, Air, and Gas valve, in low viscosity non-corrosive fluid applications.