Purge lip sealing valve (PLSV)

The most reliable and durable analytical valve

Our patent-pending purged lip sealing valve (PLSV) is a disruptive analytical valve that offers the best of both worlds: a longer lifetime than a diaphragm valve along with the constant pressure drop and simplicity of a conical rotary valve.

Designed to meet our high standards, this revolutionary technology is based on an innovative purge system as well as the valve insert’s reduced sealing surface area that replaces the traditional rotor. By design, it’s impossible for this valve to develop a cross-port leak.

Features

No leaks: Unique purge technology eliminates inboard/outboard and cross-port leaks
Long lifetime: Over 1 million actuations in UHP applications due to unique reduced surface area insert technology
Constant pressure drop: No change in pressure/flow drop characteristic across temperature range and life span
No dead volume: Internal flow path contains no unswept volume
Small footprint: With our electrical or pneumatic compact actuator, multiple valves can be installed in a constrained space, replacing existing

Technology principles

Leaks are virtually impossible by design

With its purging channels located between two adjacent valve channels and valve head purging pockets machined into the valve head, our PLSV’s unique, patent-pending design does away with leaks. The pockets connect the purging inlet and outlet through the channels, allowing purge gas to flow freely. Since the volume around the insert and in between ports is continuously removed, there are no more inboard/outboard and cross-port leaks.

Improves lifetime with reduced surface sealing area

Using finite element modeling (FEM) and real-life testing, we optimized the sealing leap size and shape. The result is a sealing surface area that’s 14% the size of a standard conical rotary valve, decreasing wear and tear and friction on the valve. What’s more, the insert material is specially treated by a proprietary process that improves the surface finish, hardness and creeping.

Products using this technology

GC and HPLC Valves

Purged lip sealing valve (PLSV)