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Stand-Alone Sequence Valve

This type of stand-alone sequence valve is used to automatically sequence positioning, clamping, and supporting functions as system pressure increases. The stand-alone sequence valve can prevent fluid flow to a portion of the fixture until a predetermined trigger pressure is achieved and easily adjustable.

The series-mounted version of the sequence valve is used for multi-stage sequencing. Namely, two to six sequence valves can be mounted in series, with only one input line. It is also available in a stand-alone version with standard fittings, and a manifold-mounted version.

To set up initially, the sequence valve should turn the adjustment screw on top until the desired trigger pressure is achieved. During normal operation, the sequence valve opens automatically when system pressure reaches the set trigger pressure. After the valve opens, system pressure rises uniformly on both upstream and downstream sides (no pressure drop upstream when the valve opens).

When mounting a sequence valve, it needs one input valve and up to five series valves. Only one pressure connection is required to the input valve’s P port. The other valves are connected by an internal passage, sealed with o-rings between each valve, o-rings furnished. Two connecting bolts are required to fasten valves together (order separately), with 1/4″ BSPP ports. It can be mounted in any position, horizontal or vertical.

According to design considerations, it would be better to choose normal-range model instead of low range whenever possible. Normal-range version provides a wider adjustment range, especially important when used with an air power unit, which has a 2200-psi minimum operating pressure. For multi-stage sequencing, set trigger pressures in steps of at least 750 psi (normal range) or 375 psi (low range).

(Edited by Eloise Tsai)

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