Parker manufactures and offers five series' of check valves. CF Series check valves feature pressure ratings of 3000 PSIG (207 Bar). C Series check valves are available in six sizes with port sizes from 1/8 inch up to one inch. 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 check valves are designed for demanding leak integrity applications.

Check and relief check valves are offered in inline, cartridge, ball check and split flange types. Check and relief check valves are spring-operated poppet valves, with optional relief settings to allow free flow in only one direction and prevent backflow. They 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-Check threaded valve is an all-purpose, spring-assisted, in-line valve. The Restrictor threaded check valve is used for applications that require higher cracking pressures to open the valve. The ALC Wafer valve is an in-line, spring assisted, single guided "wafer" check valve designed 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 check valves 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 valve styles. Plastic check valves 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.

Hy-Lok manufactures a variety of check valves, including welded check valves, compact check valves, ball check valves, high pressure check valves, and adjustable check valves. The 700 Series instrument check valves offer a pressure rating to 3,000 psi (207 bar) at 70°F (21°C), and a temperature rating from -10°F to 375°F (-23°C to 191°C) with Viton O-ring seat standard. The 700H Series high pressure compact check valves offer a pressure rating to 6,000 psi (413 bar) at 70°F (21°C), and a temperature rating from -10°F to 400°F (-23°C to 204°C) with Viton seat standard. Hy-Lok also manufactures CVA adjustable check valves with a pressure rating up to 3,000 psi (207 bar) at 70°F (21°C), and a temperature rating from -10°F to 375°F (-23°C to 191°C) with Viton seat standard.

Check-All Valve can design and manufacture their check valves for almost any application. Their flange insert valves provide the simplest most economical way to install check valves in a piping system. Wafer insert check valves are designed to fit between two mating ANSI flanges. Sanitary cartridge check valves are made of 316 stainless steel for use in new or existing sanitary systems. The Universal low pressure check valve is a one piece body machined from bar stock and is designed for minimum pressure drop. The Mini-Check valve style is a three piece constructed check valve. The three piece construction permits many combinations of end fittings, which makes the valve adaptable for nearly every application. They are available in 316 stainless steel, brass and carbon steel. There are nearly 20 types of check valves manufactured by Check-All Valve.

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 check valves offer pressure ratings for brass to 3,000 Psi, and stainless to 4,500 Psi MAWP. Poppet check valves 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 check valves are field adjustable or factory preset with pressure ratings to 3000 Psi MAWP. Inline check valves offer lower pressure ratings to 800 Psi, howerver high pressure check valves are available up to 10,000 Psi. Brass one-piece high pressure cryogenic, low pressure floating disc type and a variety of cartridge check valves are also offered by Generant.

Flomatic is a manufacturer of check valves primarily for domestic and municipal water and wastewater applications. Ball check valves come in 1" to 14" sizes (25 to 350 mm). Double check valves are available in 3/4" to 2" (20 to 50 mm). Globe style silent check valves come with a maximum pressure rating at 200 PSI: 2"-12", 150 PSI: 14"-24", while hydraulic check valves offer sizes from 1 1/2" to 12" (40 to 300 mm). Many models of submersible, ductile iron, stainless steel and swing check valves are also manufactured by Flomatic. Wafer styles have maximum pressure ratings of 200 PSI and maximum temperature ratings of 180°F (80°C). Plastic check valves offer maximum pressure of 300 PSI and a temperature maximum of 150°F (51°C). Auto drain check valves are available in bronze, stainless steel and PVC, with 10 PSI spring standard, and 5 PSI optional.

Nibco manufactures bronze, cast iron and ductile iron check valves. Bronze check valve features include horizontal swing, inline lift and bolted bonnet types 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. Cast iron models come in flanged, bolted bonnet, wafer, and twin disc grooved styles used for HVAC, steam, gas, hot and cold water, and other general utility services. Ductile iron check valves come in twin disc grooved style and bolted bonnet with pressure ratings up to 350 PSI/17.2 Bar. These valves are typically used for petroleum refining, limited chemical, oil and gas, steam, HVAC, and hot and cold water applications.

Mueller Steam Specialty is a check valve manufacturer offering cast iron, bronze, cast carbon steel, cast stainless steel and cast bronze check valves. 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. Sure Check check valves are available in cast iron, bronze, ductile iron, carbon steel and stainless steel. Standard wafer silent check valves are also offered.

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 check valves are made of anodized aluminum body material. Valve materials are either EPDM or silicone. Vacuum check valves seal and hold vacuum for clamping, pick and place and vessel evacuation applications, and offer high flow capacity for rapid evacuation.

Smith valve is a manufacturer of piston, ball and swing check valve configurations. 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. Their Class 1500 threaded and socketweld check valves include bolted cap piston, spring piston, ball and ball spring types. They also offer three classes of flanged end check valves in many of the same configurations.

Williams manufactures swing check valves for industrial and commercial applications. Their cast steel swing check valves 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. Williams also produces marine swing check valves featuring horizontal or vertical installation and monel trim, soft seat, outside lever and weight or spring, and B61-Bronze options.