Check Valves

Check Valves

Swagelok® offers a broad line of adjustable and fixed cracking pressure check valves to control back flow in general-service and high-purity applications.

Check valves:

• Are designed to allow fluids to flow in one direction only
• Are rated for use in medium- and high-pressure applications

Spring and Poppet Check Valves (C, CA, CH, CP, and CPA Series)

Spring-and-poppet check valves are available with nominal cracking pressures ranging from 1/3 to 600 psi (0.03 to 41.4 bar) in 316 stainless steel and brass and with end connections 1/8 to 1 in. and 6 to 25 mm in size.

Specifications

Working Pressures	Up to 6000 psig (413 bar)
Temperature	–50 to 400°F (–45 to 204°C)
Nominal Cracking Pressure
Fixed	1/3 to 25 psi (0.02 to 1.7 bar)
Adjustable	3 to 600 psi (0.21 to 41.4 bar)
Body Material	316 stainless steel, brass
Seal Material	Fluorocarbon FKM, Buna N
Flow Coefficient	0.10 to 4.7
End Connections
Type	Swagelok tube fittings, NPT, ISO, SAE/MS, VCO® O-ring fittings, VCR® face seal fittings
Size	1/8 to 1 in.; 6 to 25 mm

Check Valves (IPT Series)

Ball-seal poppet, soft-seal poppet or dual-seal ball check valves are available with working pressures up to 60 000 psig (4134 bar) and a nominal cracking pressure of 15 psi (1.0 bar) in 316 stainless steel with end connections 1/4 to 1 in. in size. These valves are available for sour gas applications with materials selected in accordance with NACE MR0175/ISO15156.

Specifications

Working Pressures	Up to 60 000 psig (4134 bar)
Temperature	Up to 650°F (343°C)
Nominal Cracking Pressure	15 psi (1.0 bar), optional pressures available
Body Material	316 stainless steel
Seal Options	Ball-seal poppet – metal-to-metal seat
	Soft-seal poppet – O-ring seat, standard material is HNBR
	Dual-seal ball – glass-filled PTFE seat, backed by metal-to-metal sealing
End Connections
Type	Swagelok medium-pressure tube fittings (soft-seal and ball-seal only), female NPT, cone and thread
Size	1/4 to 3/4 in. (medium-pressure tube fitting); 1/8 to 1 in. (female NPT), 1/4 to 1 in. (cone and thread)

Lift Check Valves (50 Series)

Lift check valves limit reverse flow  - forward flow lifts the poppet, opening the valve. Reverse flow seats the poppet against the orifice, closing the valve. The lift check valve is gravity assisted and must be mounted horizontally, with bonnet nut on top.

Specifications

Working Pressures	Up to 6000 psig (413 bar)
Temperature	–65 to 900°F (–53 to 482°C)
Body Material	316 stainless steel
Poppet Material	S17400 stainless steel
Flow Coefficient	0.30 to 2.20
End Connections
Type	Swagelok tube fittings, female NPT, tube socket weld or pipe butt weld
Size	1/4 to 3/4 in.; 6 mm

All-Welded, High-Purity Check Valves (CW Series)

The CW series high-purity check valve is designed for clean operation and reliable fluid containment.

Specifications

Working Pressures	Up to 3000 psig (206 bar)
Temperature	–10 to 400°F (–23 to 204°C)
Body Material	316L stainless steel
Cracking Pressure	Less than 2 psi (0.14 bar)
Maximum Back Pressure	Full pressure rating
Maximum Pressure Drop	145 psi (10.0 bar)
Minimum Burst Pressure	12 000 psig (826 bar) at 70°F (20°C)
Flow Coefficient	0.55 and 0.70
End Connections
Type	Tube butt welds, VCR® face seal fittings, Swagelok tube fittings
Size	1/4 to 1/2 in.; 6 mm

UHP Check Valves, O-Ring-Free Polymer (CHP Series)

CHP series UHP fluoropolymer check valves provide low cracking and reseal pressure and contain wetted components that meet SEMI Standard F57-0301 for ultrahigh-purity system components.

Specifications

Working Pressures	Up to 80 psig (5.5 bar)
Media Temperature	50 to 185°F (10 to 85°C)
Body Material
Small Body	Modified PTFE
Medium Body	PFA
Cracking Pressure
Small Body	Less than 1.5 psig (0.11 bar)
Medium Body	Less than 0.9 psig (0.07 bar)
Reseal Pressure	Up to 0.5 psig (0.04 bar)
Flow Coefficient	Up to 4.1
End Connections
Type	Fine thread flare, Nippon Pillar® Super 300
Size	Small body: 1/4 and 3/8 in.; 6 and 10 mm
	Medium body: 1/2 and 3/4 in.