Purged lip sealing valve (PLSV) Patented

The most reliable and durable valve

Our patented compact 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 2 million actuations in UHP applications due to unique reduced surface area insert technology
Constant pressure drop: No change in pressure/flow drop 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 diaphragm valve

Typical applications

Ultra-trace permanent gas
Ultra-trace sulfur
VOC
Hydrocarbon
Any gas chromatography applications

Models

Switching

Improved chromatograph baseline stability
No dead volume
Compact footprint
Available with pneumatic or electrical actuator
Valve head available with various coatings and surface treatments
Available in 4, 6, 8, 10, 12 and 14 ports
Insert available in various materials for chemical compatibility
Standard version available for up to 180 °C; high-temperature version available for up to 260 °C

Sample selection

Preserves sample integrity
Makes cross-sample contamination impossible
Long lifetime
Constant pressure drop
High-precision multi-position electrical actuator
Valve head available with various coatings and surface treatments
Insert available in various materials for chemical compatibility
Standard version available for up to 180 °C; high-temperature version available for up to 260 °C

Trap and release

4-step process: Sample, vent sample matrix, isolate and release
The best leak integrity: Improved performance with sensitive detectors (mass, spectrometer, DID, PDHID, PED and Epd)
Compact design
Compatible with vacuum
User configurable step sequence and duration
Medical version available for exhaled breath sampling

Technology

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 lip 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.