Marquest Scientific, Inc. - Throttle Master "L Series" Needle Valves

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.

End connections:

1/4", 3/8", 1/2" Female NPT, Solvent Socket "Slip". Tube Connections Available Click Here.

Max Pressure Ratings:

PVC: 180 PSI @ 72° Fahrenheit

CPVC: 200 PSI @ 72° Fahrenheit

Polypropylene: 150 PSI @ 72° Fahrenheit

PVDF: 220 PSI @ 72° Fahrenheit

Materials of Construction:

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).

PLEASE CLICK ITEM # BELOW TO VIEW ADDITIONAL SPECIFICATIONS & DOWNLOADS

Unit of Measure

Items	NGL-250-PVC 1/4" x 1/4" Female NPT Globe Needle Valve-PVC w/ L Series Needle List Price $88.95	NGL-375-PVC 3/8" x 3/8" Female NPT Globe Needle Valve-PVC w/ L Series Needle List Price $88.95	NGL-500-PVC 1/2" x 1/2" Female NPT Globe Needle Valve-PVC w/ L Series Needle List Price $94.95	NAL-250-PVC 1/4" x 1/4" Female NPT Angle Needle Valve-PVC w/ L Series Needle List Price $88.95	NAL-375-PVC 3/8" x 3/8" Female NPT Angle Needle Valve-PVC w/ L Series Needle List Price $88.95
Materials	N/A PVC
Inlet x Outlet	N/A 1/4" Female NPT	N/A 3/8" Female NPT	N/A 1/2" Female NPT	N/A 1/4" Female NPT	N/A 3/8" Female NPT
Style	N/A Globe Pattern, L Series Needle	N/A Globe Pattern, L Series Needle	N/A Globe Pattern, L Series Needle	N/A Angle Pattern, L Series Needle	N/A Angle Pattern, L Series Needle
Seal	N/A PTFE
Cv Factor	N/A 0.310	N/A 0.310	N/A 0.620	N/A 0.426	N/A 0.426