Parker manufactures and offers five series' of check valves. The CF Series feature pressure ratings of 3000 PSIG (207 Bar). The C Series are available in six sizes with port sizes from 1/8 inch up to one inch. Their CB Series check valves offer pressure ratings of 3000 PSIG (207 Bar) to 6000 PSIG (414 Bar), and inlet sizes of 1/16" to 3/4". The CO Series are designed for demanding leak integrity applications.

Check and relief check valves are offered in inline, cartridge, ball and split flange types. These are spring-operated poppet, with optional relief settings to allow free flow in only one direction and prevent backflow. They also feature zero leak (bubble-tight) seals at low and high pressures.

Simtech is a provider thermoplastic check valves. Their true union ball check valves are round machined with a tumbled ball. Internal splines minimize pressure drops. Simtech's wafer types are chemical resistant and compact for ease of installation. Their horizontal swing designs are designed for wastewater treatment, agricultural irrigation and chemical plant applications.

DFT manufactures in-line check valves in four different styles; threaded, wafer, flanged and sanitary. The Basic threaded valve is an all-purpose, spring-assisted, in-line configuration. The Restrictor threaded check valve is used for applications that require higher cracking pressures to open it. The ALC Wafer type is an in-line, spring assisted, single guided "wafer" design to prevent "water hammer" and "reverse" flow.

C.I. Thornburg serves the municipal water and wastewater industry in all of West Virginia, Kentucky, Tennessee and the southern part of Ohio. They offer swing type gravity operated check valves in sizes from 2 1/2" through 24". Thornburg also offers swing type lever and weight types with the same basic features. Both styles come with either FL. x FL. ends or M.J. x M.J. ends. Swing type spring and lever check valves are available with either adjustable weight or adjustable spring tension to control opening and closing of the clapper.

SMC manufactures a variety of plastic, brass and stainless steel check valves designed in ball, poppet and foot styles. Plastic types incorporate multiple configurations, sizes, materials and cracking pressures and feature pipe thread (NPT), hose barb, push-to-connect and JACO end configurations. Brass and stainless steel check valves feature piston, poppet and ball styles with pipe thread (NPT), hose barb and flare end configurations in pressure ranges to 3000 psi.

US Plastic Corp distributes a variety of check valves with spherical or ball shaped closure members. Materials include PVDF, CPVC, polypropylene and PVC. Brands also include Asahi, Cepex, Hayward, Nibco, and more. Types include Asahi PVDF, Cepex ball and economy wafer, Hayward CPVC/polypropylene/PVC true union ball, Hayward swing, mini, Nibco chemtrol true union ball, PVC true union ball, SMC PVC, and sump pump swing check valves.

Can design and manufacture their check valves for almost any application. Their flange insert configurations provide the simplest most economical way to install check valves in a piping system. Wafer insert types are designed to fit between two mating ANSI flanges. Sanitary cartridge types are made of 316 stainless steel for use in new or existing sanitary systems. Their Universal low pressure configuration is a one piece body machined from bar stock and is designed for minimum pressure drop.

Generant manufactures a broad offering of check valves, whether your application requires ultra low cracking pressures or MAWP’s of up to 10,000 Psig. Standard products offer pressure ratings for brass to 3,000 Psi, and stainless to 4,500 Psi MAWP. Poppet types come in brass and stainless steel up to 3000 Psi MAWP. One piece check valves come with many standard seal materials and crack pressures. Adjustable styles are field adjustable or factory preset with pressure ratings to 3000 Psi MAWP.

Nibco manufactures bronze, cast iron and ductile iron check valves. Bronze types feature horizontal swing, inline lift and bolted bonnet configurations with pressure ratings ranging from 125 PSI/8.6 Bar to 300 PSI/20.7 Bar. There are nearly 10 models to choose from. Typical services include hot and cold water, HVAC, steam, compressed air and gas. There are also nearly 10 models of cast iron check valves available with pressure ratings from 125 PSI/8.6 Bar to 250 PSI/17.2 Bar.

Mueller Steam Specialty is a check valve manufacturer offering cast iron, bronze, cast carbon steel, cast stainless steel and cast bronze styles. Types include wafer, globe, silent and NPT. Mueller also offers specialty products like Chexter pivot check valves in aluminum bronze, carbon steel, stainless steel, cast iron and rf carbon steel.

Vaccon is a manufacturer of the VCV Series of vacuum check valves designed for vacuum applications that require high flow and low cracking pressure. Maximum vacuum flow, with zero flow restriction, ranges from 4.0 SCFM (113 lpm) to 30.0 SCFM (849 lpm), depending on which model you choose. Cracking pressures range from 4.0 mbar to 10.7 mbar. All vacuum products are made of anodized aluminum body material. Vacuum check valves seal and hold vacuum for clamping, pick and place and vessel evacuation applications, and offer high flow capacity for rapid evacuation.

Industrial Specialties is a manufacturer and distributor of miniature pneumatic, vacuum and fluid circuitry components. Available products include a variety of check valves constructed of metal or plastic. Plastic styles include duckbill, spring-loaded, push in and diaphragm designs. Metal check valve products are offered in ball, piston and poppet configurations.

Smith valve is a manufacturer of piston, ball and swing check valves. End connections and pressure classes from 150 through 2500 are available in all types. Choose from body materials of A105, LF2, F11, F5, F22, F9,  316/316L,  304/304L, 316H, 304H, 317/317L, 321, 347, 347H, F51,  F44,  F20,  I825,  I600, and M400. Smith's Class 800 threaded and socketweld check valves include bolted cap piston, spring piston, ball, spring ball and swing types.

Williams manufactures swing check valves for industrial and commercial applications. Their cast steel swing configurations feature a seal-welded seat and bosses for taps and bypass. Options include alternate trims, NACE MR-01-75 and pressure seal design. Their stainless steel swing check valves feature teflon or graphite packing and gaskets with options like API 600 heavy wall and soft seats.