Spool Type Valves
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comatrol hydraulic cartridge valves

Spool-Type Solenoid Valves

Spool-type valves are available in 2-way 2-position, 3-way 2-position, 4-way 2-position, and 4-way 3 position configurations. For all these valves the spools are pressurebalanced and are held in position by a spring when de-energized. When the solenoid coil is energized, magnetic force overcomes the spring and shifts the spool. As the spool moves, flow forces, also known as Bernoulli forces, act on the spool and can prevent proper operation. These forces are a function of pressure and flow, and the catalog ratings show the operating limits for each valve. These limits are based on the valve’s ability to shift at 85% of nominal voltage at 140ºF ambient temperature. For this reason flow and pressure ratings for solenoid spool valves should not be exceeded.
 


Consult your Comatrol representative for extreme applications.


Two-way, two-position

Two-way, two-position spool-type valves are either normally open or normally closed.

  • Common applications for two-way, two-position spool type solenoid valves are:
  • Unloading of a fixed-displacement pump.
     
  • Cylinder regeneration. When the two-way two-position spool valve is energized
    the cylinder circuit is in regeneration mode for faster cylinder extension.

     
  • Two-speed motor (or cylinder) operation. By using multiple valves and circuit
    logic, similar circuits can be used for three-speed, four-speed, etc.
   

Three-way, two-position
Three-way, two-position spool-type valves are available with a variety of porting and flow paths.

 

  • Common applications for three-way, two-position spool type solenoid valves:
  • Control of a single-acting cylinder, clutch, or brake.
  • Circuit selector
  • Pilot control for a large directional spool.
  • Use in combination to duplicate four-way, three-position valve functions,
    creating low-cost, compact alternatives to subplate- or stack-type
    directional control valves.

   
 

Four-way, two-position
Four-way, two-position spool-type valves are available with normally-open, normallyclosed, reversing, and single-acting spool options. 


Common applications for four-way, two-position spool type solenoid valves are:

  • Directional control for motors or cylinders.
  • Use in combination to duplicate four-way, three-position valve functions, creating low-cost, compact alternatives to subplate- or stacktype directional control valves.
   


Four-way, three-position

Four-way, three-position spool-type valves are available with normally-open, normallyclosed, motor, and tandem spools.

 

These valves are typically used for directional control for motor or cylinder functions.

Typical series (or open-center) and parallel (or closed-center) circuits are shown below.


 

Parallel (closed-center) circuit

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