Valves - Fisher
Industrial valves control, regulate, isolate, and direct the flow of liquids, gases, steam, slurries, and other process media. From simple shutoff applications to precise flow control and pressure protection, selec...
Control valves regulate the flow, pressure, and temperature of fluids in various industrial processes. These valves are essential for maintaining efficiency, safety, and precision in applications such as oil and gas, chemical processing, water treatment, food and beverage, and manufacturing. Centro offers a wide selection of control valves designed to meet the demands of these industries.
Types of Control Valves
Centro provides various control valves to suit different applications, including:
- Needle valves for precise flow control in instrumentation and low-flow systems.
- Flow control valves to regulate fluid flow and maintain system stability.
- Pneumatic globe control valves for automated, high-efficiency operation.
Choosing the Right Control Valve
When selecting a control valve, it’s important to consider factors such as the type of fluid (liquid, gas, or steam), operating pressure and temperature, flow rate requirements, and system compatibility. Whether you need a manually operated valve or an automated solution, Centro offers high-performance options to meet your needs.
Why Choose Centro?
Our control valves are built for durability, precise flow regulation, and reliable performance. With a wide range of materials and configurations available, we help customers find the best solutions for their specific applications.
Browse our selection online or contact our team for expert guidance in choosing the right control valve for your system.
Valve positioners are used to achieve precise control in industrial applications where the flow of liquids, gases, or steam needs to be accurately regulated. These devices adjust the valve actuator's position based on input signals, ensuring optimal performance and efficiency in process control systems.
Types of Valve Positioners
Centro offers a full range of valve positioners to meet various industry needs, including:
- Pneumatic valve positioners—These use air pressure to adjust valve positions, and they are ideal for applications requiring fast and reliable control.
- I/P valve positioners (current-to-pressure) – Convert electrical signals (4-20mA) into pneumatic pressure to precisely control valve actuation.
- Electro-pneumatic positioners – Combine electrical and pneumatic inputs for enhanced control in automated systems.
Choosing the Right Valve Positioner
Selecting the right valve positioner depends on factors such as:
- The type of actuator (linear or rotary)
- Control signal requirements (pneumatic, electric, or hybrid)
- Environmental conditions, such as temperature and pressure
- Desired precision and response time
Why Choose Centro for Valve Positioners?
- Extensive selection of valve positioners, including pneumatic and I/P models.
- High-quality products sourced from leading manufacturers.
- Competitive pricing to ensure cost-effective solutions.
Expert support to help you find the best positioner for your system.
Whether you need a simple on/off control or a complex proportional positioning system, Centro has the right valve positioner for your application. Browse our selection online or contact our team for expert assistance in choosing the best solution for your process control needs.
$2,720.00$3,400.00
$3,399.79
$4,160.00$5,200.00
$10,881.03
$5,262.46
$21,407.20$26,759.00
$970.64
Subject to factory lead times
$7,520.00$9,400.00
$4,432.79
Subject to factory lead times
$2,454.42
Subject to factory lead times
$2,374.05
$2,560.00$3,200.00
$2,720.00$3,400.00
$3,399.79
$4,160.00$5,200.00
$10,881.03
$5,262.46
$21,407.20$26,759.00
$970.64
Subject to factory lead times
$7,520.00$9,400.00
$4,432.79
Subject to factory lead times
$2,454.42
Subject to factory lead times
$2,374.05
$2,560.00$3,200.00
- 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.