Needle Valves

larger image

PDF Leaflet

Manual

Throttle Master Needle Valves (PVC, CPVC, & Polypropylene)
Precise Flow Control with Fine Adjustment of Corrosive and High Purity Fluids

Produced in two styles: Globe pattern (straight 180°) and Angle pattern (90°).
Three standard end connections: 1/4", 3/8" and 1/2" FNPT. Tubing Connections Available.
Needle finish, SPI/SPE No. 1. Bubble tight, low torque shutoff long term performance.
All injection molded, rugged design and construction
Available in 3 Materials: PVC, Unpigmented Natural Polypro, Hi-Purity PVDF
24 Pitch metering thread. 20% Finer metering control.
PTFE, Teflon sealed, 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.

Marquest for Plastic Needle Valves and Gauge Protectors

Marquest are one of the few companies to offer an all PVC or PP Needle Valve for Throttling applications.

To go with the valves they also provide a low cost Gauge Protector or Chemical Seal also made from PVC or PP with a Teflon diaphragm barrier.

Marquest Gauge Isolators/Chemical Seals

Gauge Isolators (Gauge Guards) w/ Stainless Case - Brass Connection Gauge

PDF Leaflet

Filling Instructions

Series GI Low Profile
PVC, CPVC, & PP Gauge Isolators w/ Stainless Case - Brass Connection, Liquid Filled Gauge
Protect and Isolate Pressure Sensing Instruments

PTFE Teflon Diaphragm Standard, Viton or EPDM Available
Optimum Pressure Containment Spherical Design
Self Venting Internal Shape for "Easy Filling"
Available in 1/4" x 1/2", 1/4" x 1/4", or 1/2" x 1/2" Outlet x Inlet FNPT Connections
Metal Fasteners Have Been Eliminated to Prrevent Corrosion in Volatile Atmospheres as well as Eliminate Mechanical Stresses.
Low Profile Design eliminates Dead Volume