3 1 4 2

5 3 Lock

3 1 4 2

Lock 1 Lock 18: VALVES & REGULATORS EMIcorp.com

3-position valves are traditional for positioning, blocking or venting pneumatic cylinders. Because pneumatic valves are now commonly assembled into islands, 3-position valve functions have to be adapted in order to meet all applications allowing for exhaust back pressures and long distances between valves and cylinders.

3-Position Center Exhaust - Pressure-Free Cylinder

3-Position Pressure Center Double 3/2 NO + NO Cylinder positioning is achieved with both chambers under pressure. 5/3 Valve Center Exhaust

Pressure-Free Cylinder

Double 3/2 NC + NC (version with no exhaust check valves) Solution: common exhaust balances back pressure effect on the cylinder. Problem: island exhaust back pressures reach the cylinder and move it unexpectedly.

Using Moduflex Valves - Double 3/2 NC + NC Traditional Configuration Using Moduflex Valves - Double 3/2 NO + NO Traditional Configuration 3-Position Pressure Center - Cylinder Fitted with Locking Device

Typical 3-Position Valve Applications

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