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:
Needle finish (SPI/SPE No. 1) for bubble-tight, low-torque shutoff and long-term performance
All injection molded components for a rugged design and construction
24 Pitch metering thread for 20% finer metering control and excellent linearity of flow
PTFE-sealed needle stem for excellent chemical resistance and high purity
Integrally designed panel mounting, accommodating panel thicknesses from 1/16" to 1/2" without fasteners
No elastomers (O-Rings), metals, or lubricants, eliminating corrosion and contamination risks
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:
PVC: 180 PSI @ 72° Fahrenheit
CPVC: 200 PSI @ 72° Fahrenheit
Polypropylene: 150 PSI @ 72° Fahrenheit
PVDF: 220 PSI @ 72° Fahrenheit
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.
Overview The ultimate in on/off product cycle life, our "Life Series" needle valves comprise a Virgin PTFE tipped needle for exceptionally low torque, long life on/off operation. In applications where the end user needs to operate a needle valve from open to closed position on a high frequency basis, the "Life Series" provides all the inherent benefits of a Needle Valve while providing a longer service life compared to rigid hard seated needle valves where galling can occur from high frequency on/off operation.
Features:
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.
Valve Body & Components:Injection molded in PVC, Glass & Mineral Reinforced Polypropylene, CPVC, & High Purity PVDF. FDA, USDA, and USP standards are either met and/or exceeded, please contact us for further validation.
Stem Seal & Integral Needle Tip: The stem seal and needle tip seal are machined from 100% Virgin PTFE (Polytetrafluoroethylene).
"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
