Vacuum Relief / Anti-siphon Valves Gas Valves

The ES Series features large cross sectional O-rings, minimal leak points, and proven poppet designs. To reduce the possibility of contamination, all mounting hardware is outside of the flow path and no internal parts are threaded during assembly. A compact footprint combined with long life and... [See More]

• Valve Type: Directional; Anti-Siphon; 2-way bi-directional or 3-way normally-closed & universally ported
• Material Of Construction: Stainless Steel; ENP Carbon Steel, Nickel Iron Alloy

• Maximum Pressure: 105.00
• Actuation: Electric

DFT ® Vacuum Breakers provide effective protection against collapse of pressure vessels, tanks and rolls. They prevent condensate "back-up" when equipment is shut down or inlet steam is reduced by modulating control valves. In piping systems, DFT ® Vacuum Breakers are used to break siphons,... [See More]

• Valve Type: Metal Seated; Check; Ball Check; Hydraulic; Anti-Siphon
• Valve Size: 1.00 to 4.00

• Media: Gasoline / Diesel Fuel; High Purity; LP Gas; Natural Gas; Sour Gas; Specialty Corrosive
• Connection Description: Threaded; Face Seal; MNPT

BALANCING VALVE, PRESSURE REDUCING AND RELIEF VALVE, GASKET TYPE, CONTROL PORT: A PORT, PRESSURE ADJUSTMENT RANGE 1, 2, EXTERNAL DRAIN (03 SIZE ONLY), WITH HANDLE. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Balancing; Control Valve; Drain; Relief; Anti-Siphon

SAFETY VALVE, PRESSURE RELIEF, MODEL 6010, SIDE OUTLET, 0.216 IN2 ORIFICE, 3/4 IN INLET, 1 IN OUTLET, METAL SEAL, PLAIN LEVER, AIR/GAS ASME SEC VIII/XIII, SS SPRING, 50 PSIG PRESSURE. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Relief; Safety; Anti-Siphon

RELIEF VALVE, 9400 SERIES, GAS / CRYOGENIC SYSTEMS, 1/4 INCH MALE NPT INLET, BRASS, FLUOROSILICONE SEAT, 60 PSIG. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Relief; Anti-Siphon

• Material Of Construction: Brass / Bronze

RELIEF VALVE, MALE X FEMALE NPT, ORIFICE D, 1/2 INCH INLET, METAL TO METAL, THREADED CAP, NON CODE AIR / GAS, SST SPRING MATERIAL. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Relief; Anti-Siphon

• Connection Description: Threaded

SAFETY VALVE, PRESSURE RELIEF, MODEL 6010, SIDE OUTLET, 0.121 IN2 ORIFICE, 1/2 IN INLET, 3/4 IN OUTLET, METAL SEAL, PLAIN LEVER, AIR/GAS ASME SEC VIII/XIII, SS SPRING, 120 PSIG PRESSURE. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Relief; Safety; Anti-Siphon

RELIEF VALVE, MODEL 330S, 1/4 INCH MNPT, GAS ASME SECTION VIII, 6500 PSIG, 186 SCFM CAPACITY, URETHANE SOFT SEAT. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Relief; Anti-Siphon

DISCONTINUED BY MANUFACTURER, PROPORTIONAL RELIEF VALVE, 1/4IN MALE NPT X 1/4IN FEMALE NPT, 1500-2250 PSIG, SET FOR 2000 PSIG, LIQUID OR GAS, ETHYLENE PROPYLENE SEAL. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Relief; Anti-Siphon

DISCONTINUED BY MANUFACTURER, PROPORTIONAL RELIEF VALVE, 1/4IN MALE NPT X 1/4IN FEMALE NPT, 5000-6000 PSIG, SET FOR 5500 PSI, LIQUID OR GAS, ETHYLENE PROPYLENE SEAL. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Relief; Anti-Siphon

SAFETY VALVE, PRESSURE RELIEF, MODEL 6010, SIDE OUTLET, 0.216 IN2 ORIFICE, 3/4 IN INLET, 1 IN OUTLET, METAL SEAL, PLAIN LEVER, AIR/GAS ASME SEC VIII/XIII, SS SPRING, 150 PSIG PRESSURE. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Relief; Safety; Anti-Siphon

PRESSURE RELIEF VALVE, 1500 PSI AIR / GAS, 1/4 MNPT, BRASS. FREE 2 YEAR RADWELL WARRANTY [See More]

• Valve Type: Relief; Anti-Siphon

• Material Of Construction: Brass / Bronze

The Bushing Valve is a check valve with a standard bushing housing. The valve is adaptable to many types of service applications. It has very little restriction and produces a low pressure drop. It can be used quite effectively in systems where flow and pressure drop are critical by the use of a... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon; Bushing Valve
• Valve Size: 0.50

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Threaded; Face Seal (optional feature); 3/8 NPT

Vacuum pressure relief module for vacuum pump protection. The vacuum pressure relief module is used to protect the vacuum pump from excess pressure. Even in cases of rapid pressure rises (up to 4,350 psi) the vacuum pressure relief module protects the vacuum pump and its peripherals effectively. If... [See More]

• Valve Type: Relief; Anti-Siphon
• Valve Size: 0.47

• Media: High Purity
• Connection Description: Threaded; Clamp Flange

For extremely precise control of larger flows, very precise repeatability [See More]

• Valve Type: Metal Seated; Needle; Control Valve; Hydraulic; Metering; Mixing; Sampling; Shut Off; Anti-Siphon
• Connection Description: Threaded; 1/4" FNPT

• Valve Size: 0.12
• Maximum Pressure: 3000.00

The original dual diaphragm design, with lifetime warranty. [See More]

• Valve Type: Pilot; Anti-Siphon

• Media: 1

The Butt Weld (B4) check valve is a one piece body machined from bar stock, eliminating porosity concerns and providing uniform density for more consistent welds. Made to ASME/ANSI B16.25 for schedule 40 pipe, it carries rugged, dependable Check-All trim with a wide variety of seat materials and... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.50

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Butt Weld; Face Seal (optional feature)

Vacuum pressure relief module for venting to the outside for vacuum pump protection. The TVS21 vacuum pressure relief module is used to protect the vacuum pump from excess pressure. The vacuum pressure relief module type TVS21 protects the pump from damages by venting the excess pressure safely into... [See More]

• Valve Type: Relief; Anti-Siphon
• Valve Size: 0.47

• Media: High Purity
• Connection Description: Threaded; Clamp Flange

The Connector Valve is a check valve with a hex nipple or connector housing. It is designed to be used in installations where check valves with male pipe threads are required. The Connector Valve is adaptable for use as a check valve, vacuum breaker, or low pressure relief valve. Two valves used in... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Relief; Anti-Siphon
• Valve Size: 0.50

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Threaded; Face Seal (optional feature); 1/2 NPT

Flange Insert valves are the ultimate check valves in flanged systems. They provide the simplest most economical way to install check valves in a piping system, the valve body automatically positions the valve and holds it in place while bolts are being installed and tightened. All that is required... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.50

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: BoltFlange; Face Seal (optional feature); 1-3/8" O.D. Flange

The Check-All Flanged & Drilled check valve is a one-piece cast body valve with ANSI/ASME B16.5 Class 150 flanged ends. The HVFD series valve is used when higher flow rates and lower pressure drops are required. The valve is available in sizes 1 through 10 inches and standard materials of 316... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 1.00

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: BoltFlange; Face Seal (optional feature); 4-1/4" O.D. Flange

The Check-All Flanged & Drilled - PTFE Lined check valve is a one-piece body valve with ANSI/ASME flanged ends. The valve has a solid one-piece PTFE liner, which covers the flange faces out to the raised face diameter. All wetted surfaces are fluoropolymer (PTFE/FEP/PFA) including the FEP... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 1.00

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: BoltFlange; Face Seal (optional feature); 4-1/4" O.D. Flange

The Lined Pipe Insert valve is designed to mate between two flanges on most lined pipe systems. It provides the simplest most economical way to install a check valve in a lined piping system. No gaskets are required, just spread the flanges, center the valve and bolt the flanges together. Lined Pipe... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 1.00

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: BoltFlange; Face Seal (optional feature); 2" O.D. Flange

The Check-All Mini-Check is a three piece constructed check valve. The valve is designed for minimum pressure drops. The three piece construction permits many combinations of end fittings, which makes the valve adaptable for nearly every application. The Mini-Check is available with 1/8, 1/4, and... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.12

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Threaded (optional feature); Compression (optional feature); Tube Fitting; Face Seal (optional feature); 1/8 Pipe Size

The Sanitary Cartridge Valve is a 316 stainless steel check valve for use in new or existing sanitary systems. The SCV design seals on the ID of sanitary ferrules with replaceable food grade seals (Standard is FDA EPDM). The valves fit the Alfa Laval Inc. Bevel Seat and Tri-Clamp ® fittings, the... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Cartridge; Poppet; Directional; Relief; Sanitary; Anti-Siphon
• Valve Size: 0.75

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Clamp Flange (optional feature); Union (optional feature); Butt Weld; Face Seal (optional feature); 3/4" Line Size

For over 35 years, the compact, fluoropolymer (PTFE/FEP/PFA), Sanitary Insert Valve has been used as the most economical solution to providing a check valve in a new or existing sanitary piping system. This valve style is designed to fit into grooved-end clamp-type fittings. Since the Sanitary... [See More]

• Valve Type: Check; Lift Check; Back Flow; Poppet; Directional; Relief; Sanitary; Anti-Siphon
• Valve Size: 0.75

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Clamp Flange; Butt Weld; Face Seal (optional feature); 3/4" Line Size

The 3-A Sanitary Check Valve is an all 316/316L stainless steel check valve with a standard 32 Ra or better finish, (finer available) for use in new or existing sanitary systems. The 3SC design seals on the ID of sanitary ferrules with 3-A specified materials (standard is EPDM). The valve seals... [See More]

• Valve Type: Check; Lift Check; Back Flow; Poppet; Directional; Relief; Sanitary; Anti-Siphon
• Valve Size: 1.00

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Clamp Flange; 1" Line Size

The Straight Sided Insert is a thread less check valve. designed to be inserted into any cavity where a check valve is needed and threads are not desired. Available Materials: 316 Stainless Steel (SS). Carbon Steel (CS). Alloy 20 (A2). Alloy C-276 (HC). Brass (BR). Alloy B (HB). MONEL ® (MO) [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.50

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Compression; Face Seal (optional feature); 5-23/64" O.D. Flange

The Tubing Check Valve-Flared is a three piece constructed valve with 37 º flared ends which conform to J. I. C. and S. A. E. Hydraulic Standards. These valves are designed for maximum flow with minimal pressure drop. Available Materials: 316 Stainless Steel (SS). Brass (BR). Carbon Steel (CS) [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.25

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Threaded; Tube Fitting (optional feature); Face Seal (optional feature); 1/4" Tubing Size

The Tubing Check Valve is a three piece constructed check valve with flareless tube ends. The valve is designed for minimum pressure drops. The valves are furnished complete with ferrules and nuts. Available Materials: 316 Stainless Steel (SS). Brass (BR). Carbon Steel (CS) [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.12

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Compression (optional feature); Tube Fitting; Face Seal (optional feature); 1/8" Tubing Size

The Union Insert Valve is the threaded pipe counterpart of the Flange Insert Valve. Designed to be inserted into most standard ground joint unions, it provides the simplest and most economical way to install a check valve in a threaded pipe system. A check valve may be installed anywhere in the... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.50

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Union; Face Seal (optional feature); 1/2" Line Size

The Universal High Pressure check valve is a one piece body machined from bar stock with female pipe threads. The valve is designed and manufactured for high pressure applications. For applications below 3000 PSIG, view our UN-3 series. Available Materials: 316 Stainless Steel (SS). Alloy B (HB). [See More]

• Valve Type: Metal Seated; Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.38

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Threaded; Face Seal (optional feature); 3/8 NPT

The Universal Low Pressure check valve is a one piece body machined from bar stock and is designed for minimum pressure drop. The valve is light, compact, and provides maintenance free dependable service. For applications above 3000 PSIG, view our UN-10 series. For applications where weld joint are... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.38

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Threaded; Face Seal (optional feature); 3/8 NPT

The Universal Socket Weld check valve is machined from bar stock and designed for a minimum pressure drop. It carries rugged, dependable Check-All trim and there is a wide variety of seat materials and cracking pressures to choose from. This valve series is particularly attractive when weld joints... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.38

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: Socket Weld; Face Seal (optional feature); 3/8 Pipe Size

The Wafer Insert (WV) valve is designed to fit between two mating ANSI flanges. Two gaskets are required, instead of the one normally used. The "drop in" valve body fits inside the bolt circle for quick installation and removal in rigid piping applications where the use of the F1, F6, or FP are not... [See More]

• Valve Type: Metal Seated (optional feature); Check; Lift Check; Wafer; Back Flow; Poppet; Directional; Hydraulic; Relief; Anti-Siphon
• Valve Size: 0.50

• Media: Gasoline / Diesel Fuel (optional feature); High Purity (optional feature); LP Gas (optional feature); Natural Gas (optional feature); Sour Gas (optional feature); Specialty Corrosive (optional feature); Liquids
• Connection Description: BoltFlange; Face Seal (optional feature); 1-3/8" O.D. Flange