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.
Key features:
Note: End connections for the Throttle Master Needle Valves include 1/4", 3/8", and 1/2" Female NPT, as well as solvent socket "slip" connections. Tube connections are also available.
Maximum pressure ratings vary by material:
The valve body and components are injection molded using high-quality materials, including PVC, glass and mineral reinforced Polypropylene, CPVC, and high-purity PVDF. These materials meet and/or exceed FDA, USDA, and USP standards. The stem seal is machined from 100% virgin PTFE (Polytetrafluoroethylene) for superior sealing performance.
For additional specifications and downloads, including data sheets, click on the item numbers below.
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.
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
