Spool Type Pressure Control Valve

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SpoolType Pressure Control Valve


Thepaper aims at discussing the entire scope of spool type pressurecontrol valves, which includes but not limited to: types,composition, classifications and applications.Spooltype pressure control valves are directional control valves whosemain principle is to control fluid flow in a pneumatic circuitsystem. The primary functions of spools in directional control valvesconstitute changing of fluid directional flow, allowing fluid flowand stopping fluid flow. These three functions occur simultaneouslyto achieve desired fluid control (Dindorf, 2012).

Accordingto Dindorf (2012), directionalcontrol valves receive signals to redirect, release or stop fluidflow in them. The spools are vital in the execution of these threetasks graduallyeffectingthe desired fluid direction control. Directional control valvesconstitute spools in their working principle consequentlyreferred to as pressure control spool valves. Primary uses of spoolvalves include:

  1. Control or isolate of fluid flow to particular branches of a circuit.

  2. Cease, initiate, accelerate, decelerate and redirect motion of fluid in a pneumatic circuit system.

  3. To open relief valve.

Spooltype pressure control valves are classified based on fluid path,characteristics of the design, method of fluid control andconstitution of internal moving parts, (Dindorf, 2012).Differentspool valves classification has different specialized applicationsand constitutes different advantages and disadvantages depending onareas of use.

Spoolvalves are operated or actuated in four different ways, which includemanual, solenoid, mechanical, and pilot operated. A good example ofspool valves is the check valve, which allows unidirectional fluidflow and restricts flow in the opposite direction (Dindorf, 2012).


Spooltype pressure control valves are directional control valves thatdictate fluid flow to achieve specifically designed effects.Thesevalves receive signals either mechanically, manually, electrically orvia fluid pilot signals to cease, initiate, accelerate, decelerateand redirect the fluid flow.Inanypneumatic system, fluid control is vital since an inefficiency in thecontrol components may cause a malfunction of the entire system.


Dindorf,R. (2012).Fluid Power Control Systems.Academic Textbook. Kielce University of Technology Faculty ofMechatronics and Machine Design. Kielce, Poland. Retrieved fromhttp://mechatronika.tu.kielce.pl/store/public/PDF/FPCS%20Academic%20Textbook.pdf.