Marquest Scientific Needle Valves provide precision flow control of corrosive and high purity fluids. Operating pressures and flow rates up to 220 PSI and 12 GPM respectively. There are no elastomers, lubricants, or metals used in their construction. Available in PVC, CPVC, Polypro, & PVDF with PTFE seals and a variety of end connection options, the Marquest Scientific Needle Valve will handle the toughest of applications.
PTFE On/Off seal is easily replaced in the field, no tools required
Exceptional Low Torque on/off operation
Needle finish, SPI/SPE No. 1. Bubble tight, low torque shutoff long term performance.
All injection molded, rugged design and construction
24 Pitch metering thread. 20% Finer metering control. Excellent Linearity of Flow.
Needle Stem is PTFE sealed for excellent chemical resistance & high purity.
Integrally designed panel mounting, no fasteners required, mounts to panel thicknesses from 1/16" to 1/2".
No elastomers (O-Rings), metals or lubricants, no corrosion, no contamination.
"L Series" Repair Kits for Marquest Lab Fixtures & Throttle Master Needle Valves The Ultimate in On/Off Product Cycle Life *Offers all new PTFE Sealing with Unlimited Life Warranty. PTFE on/off seal is easily replaced in the field, no tools required. Exceptional low torque on/off operation Parts List: L Series PTFE Tipped Needle, Threaded Insert, Bonnet"Cap", Handle, Color I.D. Ring
Celebrating over 40 Years
1978 - 2020