Poppet vs. Spool Valves, Why Valve Type Matters
When selecting 2-Way and 3-Way valves for your pneumatic circuit, be sure to take the internal design of the valve into consideration. While overall function is the same, the use of a poppet or a spool may have an unexpected impact on your application. Both of these valve styles, as well as their advantages and disadvantages, are explained below.
A poppet is a valve component which covers an internal passage and is held in place by air pressure and a spring (Figure A). Pneumatic 2-Way & 3-Way valves with an internal poppet design require the combination of a spring & air pressure to hold the valve in the unactuated position. When actuated, a stem pushes the poppet away from the seat to allow air flow.
Advantages
Disadvantages
A spool is a valve component which features seals mounted along its surface (Figure B). When the valve is actuated, the spool shifts causing the seals to travel along the bore, opening ports to allow air flow.
Advantages
Disadvantages
Also Read: Solenoid Operated Valves & Latching Valves
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