Marquest Scientific’s line of Throttle Master Needle Valves provide precise flow control with fine adjustment of corrosive and high purity fluids. Available in two styles, both straight pattern (straight 180° ) and Angle pattern (90° ). Three standard end connections: 1/4″, 3/8″ and 1/2″ Female NPT. Tubing, solvent, & fusion connections are available. A PTFE, Teflon sealed metering chamber offers excellent chemical resistance & high purity. There are no metals, elastomers, or lubricants used in their construction.
• 200 psi rating for PVC, CPVC, PVDF. 150 psi rating for PP
• Cv Factors: .310 thru . 780 at Full Open
| SIZE | STRAIGHT | ANGLE | |
|---|---|---|---|
| PVC | |||
| 1/4" NPT | NG-250-PVC | NA-250-PVC | |
| 3/8" NPT | NG-375-PVC | NA-375-PVC | |
| 1/2" NPT | NG-500-PVC | NA-500-PVC | |
| CPVC | |||
| 1/4" NPT | NG-250-CPV | NA-250-CPV | |
| 3/8" NPT | NG-375-CPV | NA-375-CPV | |
| 1/2" NPT | NG-500-CPV | NA-500-CPV | |
| POLYPROPYLENE | |||
| 1/4" NPT | NG-250-PPR | NA-250-PPR | |
| 3/8" NPT | NG-375-PPR | NA-375-PPR | |
| 1/2" NPT | NG-500-PPR | NA-500-PPR | |
| PVDF | |||
| 1/4" NPT | NG-250-PVD | NA-250-PVD | |
| 3/8" NPT | NG-375-PVD | NA-375-PVD | |
| 1/2" NPT | NG-500-PVD | NA-500-PVD | |