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.
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Throttle Master Needle Valves: Precise Flow Control for Corrosive and High-Purity Fluids
Marquest Scientific Throttle Master Needle Valves, available in PVC, CPVC, Polypropylene, and PVDF materials, are designed to provide precise flow control and fine adjustment when handling corrosive and high-purity fluids in various applications. These valves are produced in two styles: globe pattern (straight 180°) and angle pattern (90°), offering excellent performance and durability.
The L Series "Life Series" needle valve is uniquely engineered with a virgin PTFE (Teflon) tip designed specifically for high-frequency on/off cycling—ideal for applications where the valve is opened and closed daily throughout the product's lifecycle. Unlike traditional needle valves, which are typically set once and left in position, the L Series is built for repetitive actuation without wear or galling, offering exceptional low-torque operation, long-term bubble-tight sealing, and easy field maintenance—making it the preferred choice for demanding, high-cycling environments.
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"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
