Check Valve Manufacturer in USA - Low Carbon steel Valve

Check Valve Manufacturers in USA

SVR Global manufactures check valves that allow flow in one direction only, closing automatically when flow reverses or stops. This protects pumps, compressors, and piping systems from backflow damage and water hammer. Our range includes swing, lift, dual plate, and silent check valve designs, tested to API 594.

For specialized service conditions, we also offer API 6A check valve and AWWA swing check valve built to industry specific standards."

What is a Check Valve?

A check valve allows fluid to flow in one direction and closes automatically to block flow in the reverse direction. Unlike a ball valve or gate valve, it has no external handle or actuator, the flow itself opens and closes the valve, based on a pressure differential across the disc, ball, or flap inside.

Types of Check Valves:

Dual plate check valve
Forged steel check valve
Lift Check valve
Non slam swing check valve
Pressure Seal check valve
Single plate check valve
Swing check valve
Tilting disc check valve

Check Valve Specifications:

Spec	Range
Size	1/2" - 48"
Type	Swing, lift, dual plate, ball, wafer, tilting disc
Cracking Pressure	0.5 – 5 PSI (standard); higher on request
Pressure Class	150# – 1500#
Body Material	Carbon steel, stainless steel, cast iron, bronze
Temperature Range	-20°F to 750°F

Check valve Working Principle:

The forward flow moves the internal mechanism of the disc, ball, or flap, which is attached to the seat depending on the valve type, away from the seat, creating an open passage for the flow through the valve. As soon as the flow rate decreases or changes direction, the pressure differential becomes less than that necessary to keep the valve open, and the internal mechanism closes the valve by returning to the seat.

Importance of Backflow Prevention:

In case of an unforeseen reversal of flow due to pump shut off, loss of electricity, or a pressure surge causing reverse flow through the line.
The flow will carry contaminated water back into the clean system, siphon out the pump, and close off the closing mechanism so forcefully that it results in damage to the pipe connections and supports.
The latter case, which is called "water hammer," happens to be one of the major sources of failure in piping systems connected to the discharge side of pumps.

Check valve Installation Guidelines:

Swing check valves are generally installed in horizontal lines, since their disc relies partly on gravity to assist closure.
Lift check valves can be installed vertically (flow moving upward) because their disc moves straight up and down in line with the flow.
Dual plate and spring loaded designs are less orientation sensitive, since the spring not gravity drives closure, making them suitable for both horizontal and vertical runs.
Installing a check valve in the wrong orientation for its type is one of the more common causes of premature failure or incomplete closure.

Check valve Materials of Construction:

Material	Typical Use
Carbon steel	General industrial service
Stainless steel	Corrosive fluids
Cast iron	Water and wastewater lines
Bronze	Lower pressure water service

End Connections and Sizing:

Check valves are available with flanged, threaded, wafer, and weld end connections. Wafer style dual plate valves are common on larger lines because they're lighter and shorter face to face than a swing check of the same size, reducing both cost and the length of pipe run needed to accommodate the valve.

Pressure and Temperature Ratings:

Check valves are rated Class 150 through Class 1500 under ASME B16.34, with cast iron and bronze bodies generally limited to lower classes and carbon or stainless steel bodies covering the higher pressure range. Standard elastomer sealed valves handle up to roughly 300°F, while metal seated designs extend to around 750°F.

Applications Across Industries:

Water and wastewater treatment - Backflow prevention across treatment and distribution lines.
Marine & Shipbuilding - Ballast, bilge, and seawater systems; critical backflow protection for vessel and offshore platform safety.
Mining & Mineral Processing - Slurry transfer and tailings lines; protects pumps in abrasive, high-solids continuous operation.
Petrochemical & Chemical Processing - Process unit discharge and chemical transfer lines; prevents cross contamination and protects pumps during shutdown sequences.
Power Generation - Boiler feedwater and cooling water systems protects boiler feed pumps and turbines from reverse flow damage during trip events.

Installation Best Practices to Prevent Failure :

Match valve type to line orientation swing check valves need a horizontal run, lift check valves need vertical, upward flow, so gravity can assist closure as designed.
Confirm the flow direction arrow on the valve body aligns with actual flow before installation, since a reversed valve will block flow entirely.
Sizing the valve to line velocity an undersized valve can cause disc flutter and premature wear over repeated cycles.
Match cracking pressure to the system's startup conditions, especially on low forward-pressure lines, so the valve opens reliably when flow begins.
Check orientation and flow direction during routine inspection, not just at installation, since a valve moved or replaced later can end up misaligned.

Pump Protection Solutions:

A check valve installed on a pump discharge line stops water from flowing backward through the pump when it shuts off, which would otherwise spin the impeller in reverse and can damage the shaft, bearings, or seal over repeated cycles.
On multi pump systems, a check valve on each discharge line also stops running pumps from forcing flow backward through pumps that are stopped for maintenance or standby.
Matching cracking pressure and closing speed to the specific pump's shutoff characteristics is the main variable in selecting the right valve for this application.