Valves - Spirax Sarco
Valves start, stop, throttle and protect the flow in your piping system. Centro stocks ball, butterfly, gate, globe, check, control and specialty valves for water, steam, air, chemicals and slurries, in both manual...
Valve accessories add control, feedback and protection to valves. Actuators, positioners, limit switches, handles and locking devices make valves easier and safer to run.
Accessories Available
- Actuators – pneumatic and electric automation
- Positioners – modulating control
- Limit switches – position feedback
- Gear operators and handwheels – manual operation
- Locking devices and extensions – safety and access
Choosing Accessories
Match valve type, size and mounting standard (ISO 5211). Choose environmental ratings for the installation.
Centro supplies valve accessories and automation packages.
Related categories: Valves | Gate Valves | Ball Valves | Valve Repair Kits & Parts
Check valves are mechanical devices designed to allow fluid—whether liquid or gas—to flow in only one direction, preventing backflow that can damage equipment or disrupt system performance. Commonly used in industrial, plumbing, and MRO (maintenance, repair, and operations) systems, they automatically open with forward flow and close when flow reverses. Available in various types like swing, ball, and inline designs, check valves are essential for ensuring system integrity, protecting pumps and compressors, and maintaining operational safety.
Types of Check Valves We Offer:
- Swing Check Valves – Ideal for irrigation and low-pressure systems
- Ball Check Valves – Reliable for wastewater and slurry applications
- Piston Check Valves – Designed for precise flow control in hydraulic systems
We partner with leading manufacturers to provide top-quality materials and engineering in every check valve we supply. Browse our extensive selection and find the perfect check valve for your needs. Order online today or contact our experts for assistance!
Related categories: Valves | Needle Valves | Control Valves | Cryogenic Valves
Pressure reducing valves lower incoming pressure to a steady, safe downstream level. They protect equipment, reduce leaks and wear, and keep steam, water, air and gas systems running at the right pressure even when demand changes.
Pressure Reducing Valve Types
- Direct-acting valves – simple, compact and economical for small flows
- Pilot-operated valves – precise control at higher flow rates
- Steam PRVs – for heating, process and humidification
- Water PRVs – protect building and process water systems
- Air and gas regulators – for plant air and fuel gas
Sizing a PRV
Size the valve for flow and pressure drop, not simply the pipe size, because an oversized PRV hunts and wears quickly. You'll need inlet and outlet pressure, maximum and minimum flow, and media temperature. Install a strainer ahead of the valve and a relief valve downstream for protection.
Centro can help you size and select pressure reducing valves for steam, water, air and gas.
Related categories: Valves | Relief Valves and Vacuum Breakers | Diaphragm Valves
$747.71
Subject to factory lead times
$487.54
Subject to factory lead times
$458.24
Subject to factory lead times
$678.56
Subject to factory lead times
$668.02
Subject to factory lead times
$560.20
Subject to factory lead times
$529.73
Subject to factory lead times
$739.51
Subject to factory lead times
$676.22
Subject to factory lead times
$637.55
Subject to factory lead times
$907.09
Subject to factory lead times
$1,332.51
Subject to factory lead times
$990.30
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$2,404.85
Subject to factory lead times
$747.71
Subject to factory lead times
$487.54
Subject to factory lead times
$458.24
Subject to factory lead times
$678.56
Subject to factory lead times
$668.02
Subject to factory lead times
$560.20
Subject to factory lead times
$529.73
Subject to factory lead times
$739.51
Subject to factory lead times
$676.22
Subject to factory lead times
$637.55
Subject to factory lead times
$907.09
Subject to factory lead times
$1,332.51
Subject to factory lead times
$990.30
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$1,858.72
Subject to factory lead times
$2,404.85
Subject to factory lead times
- Use a ball valve for simple on/off shutoff, a control valve when you need to regulate flow rate or pressure, and a check valve to prevent backflow. The choice comes down to whether you need to stop flow, control it, or protect against reverse flow.
- Cv is the flow coefficient — how much water a valve passes at a given pressure drop. Full port means the valve opening matches the pipe diameter for unrestricted flow; regular port is slightly smaller. End connections describe how the valve connects to pipe (NPT threads, flanges, etc.). Body material determines compatibility with your media and environment — brass, stainless, and PVC are the most common.
- Start with your required Cv based on flow rate and pressure drop. Then confirm the valve's pressure and temperature ratings exceed your system's maximums. Undersizing causes excessive pressure drop; oversizing reduces control precision. Always size for your actual operating conditions, not system maximums.
- Fail-open means the valve opens if power or signal is lost; fail-closed means it closes — critical for safety applications. NPT is a threaded connection best for smaller pipes and lower pressures. Flanged connections bolt between pipe flanges and are preferred for larger pipes, high pressure, or applications requiring frequent removal.
- Ball valves use a rotating ball for fast quarter-turn shutoff and are ideal for frequent operation. Gate valves use a rising gate for full open/close and are better for infrequent operation where minimal flow restriction matters. Ball valves are generally more reliable, longer lasting, and easier to operate.
- Because no single valve works well in every application. Pressure, temperature, media type, flow control needs, pipe size, and safety requirements all vary dramatically across industries. Each valve type is engineered to solve a specific set of those problems efficiently.
- Ball valves offer tighter shutoff and are better for smaller lines or where zero leakage matters. Butterfly valves are lighter, more compact, and more cost-effective for larger diameter pipes. For high-volume water flow in large lines, butterfly valves are typically the practical choice.
- Look for stainless steel or carbon steel body construction, graphite or metal seat materials, and valves rated for your specific pressure-temperature combination. Globe valves and ball valves with metal seats are commonly used in high-temp applications. Always verify the valve's published P-T rating before specifying.
- Match the valve type to your application (shutoff, control, or check). Verify body material compatibility with your media. Confirm pressure and temperature ratings exceed operating conditions. Consider end connection type, actuation method, and maintenance requirements. When in doubt, over-specify on pressure rating rather than under.