Page 380 - Praxair - Specialty Gases and Equipment Reference Guide

Accessories

Check Valves and Relief Valves

CV5600 Series Check Valves
Check valves ensure that gases or liquids flow in one direction only. When
used on the outlet line of pressure regulators, they prevent back flow of
fluids into the regulator. When used in cylinder pigtails, they prevent gas
flow from one cylinder into another on the same manifold. They also stop
air from entering the pigtail and manifold when a cylinder is removed.
These check valves are bubble-tight against any back pressure.
Note: Check valves are also available housed within a CGA
connection – see page E •382 for additional information.

Specifications Materials
1/4" Compression 1/4" FPT
n Approximate Weight n Spring/Poppet
4 oz Type 316 Stainless Steel Check Valve Check Valve

Ordering Information
Part Maximum Operating Cracking Connections Body Seal Flow
Number Pressure (psig) Pressure (psig) Inlet Outlet Material Material Coefficient (Cv)
PRSCV5651 3000 1.0 1/4" NPT male 1/4" NPT male Brass Viton 0.5
®
PRSCV5652 3000 1.0 1/4" NPT female 1/4" NPT female Brass Viton 0.5
®
PRSCV5653 3000 1.0 1/4" compression 1/4" compression Brass Viton 0.5
®
PRSCV5654 3000 5.0 1/4" NPT male 1/4" NPT female Brass Viton 0.5
®
PRSCV5660 6000 1.0 1/4" NPT male 1/4" NPT male 316 SS Buna-N 0.5
®
PRSCV5661 6000 1.0 1/4" NPT male 1/4" NPT male 316 SS Viton 0.5
®
PRSCV5663 6000 1.0 1/4" NPT female 1/4" NPT female 316 SS Viton 0.5
®
PRSCV5665 6000 1.0 1/4" NPT female 1/4" NPT female 316 SS Buna-N 0.5
®
PRSCV5666 6000 1.0 1/4" compression 1/4" compression 316 SS Viton 0.5
®
PRSCV5667 3000 1.0 1/4" compression 1/4" compression 316 SS Kalrez 0.42
®
PRSCV5668 6000 1.0 1/4" compression 1/4" compression 316 SS Buna-N 0.5
®
PRSCV5669 6000 5.0 1/4" NPT male 1/4" NPT female 316 SS Viton 0.5 Section E – Gas Handling Equipment
®
PRSCV5670 3000 1.0 1/4" compression 1/4" NPT male Brass Viton 0.5
®
PRSCV5672 6000 1.0 1/4" compression 1/4" NPT male 316 SS Viton 0.5
®
PRSCV5674 3000 1.0 1/4" male vacuum 1/4" male vacuum 316L SS Viton 0.36
®
PRSCV5675 3000 1.0 1/4" male vacuum 1/4" male vacuum 316L SS Kalrez 0.36
®
RV5571, RV5572, RV5580 Series Relief Valves
Relief valves are commonly used downstream of pressure regulators to
protect the regulator, delivery pressure gauge and downstream system
from damage due to overpressurization caused by a regulator failure.
When properly installed they may be used with hazardous gases
because they have 1⁄4" NPT outlets which permits vented gas to be
piped to a safe disposal system.
Specifications
n Reseat Pressure n Outlet Connection
70% of set pressure Model RV5572: 1/4" MPT
RV5571 RV5572 RV5580
n Inlet Connection n Approximate Weight
1⁄4" MPT Model RV5580: Relief Valve Relief Valve Relief Valve
8 oz
n Outlet Connection
Models RV5571, RV5580: Models RV5571 and RV5572:
1/4" FPT 2 oz Ordering Information – Field adjustable relief valves
Part Adjustable Body Seal Flow
Number Range Material Material Coefficient (Cv)
Ordering Information – Relief valves, adjustable prior to installation PRSRV5580-225 10–225 316 SS Viton 0.60
®
PRSRV5580-350 50–350 316 SS Viton 0.41
®
Part Adjustable Body Seal Flow ®
Number Range (psig) Material Material Coefficient (Cv) PRSRV5580-750 350–750 316 SS Viton 0.41
®
PRSRV5571-20 10-20 Brass Viton 0.37 PRSRV5580-1500 750–1500 316 SS Viton 0.41
®
®
PRSRV5571-100 20-100 Brass Viton 0.37 PRSRV5580-2250 1500–2250 316 SS Viton 0.41
®
®
PRSRV5571-250 100-250 Brass Viton 0.37 PRSRV5580-3000 2250–3000 316 SS Viton 0.41
®
®
PRSRV5571-500 250-500 Brass Viton 0.37 PRSRV5580-4000 3000–4000 316 SS Viton 0.41
®
PRSRV5580-5000 4000–5000 316 SS Viton 0.41
®
PRSRV5580-6000 5000–6000 316 SS Viton 0.41
®
1-877-PRAXAIR www.praxairdirect.com E•379