Control Valve Manufacturers in USA
SVR Global, we design, fabricate, and test control valves used for industrial processes where there is a need for regulated flow, pressure, or temperature. Our operations take place within the U.S, thus ensuring shorter delivery time, engineering assistance, and adherence to domestic requirements for the manufacture of control valves.
What is a Control Valve?
Control valves are unique types of valves that are designed to control the flow rate, pressure, temperature, or liquid level of process fluid using variable flow area based on the input signal from the controller. In contrast to regular valves, which are operated through the mechanism of being open or closed fully, control valves are partially open or partially closed.
Unlike on/off valves such as Gate valve, or Butterfly valves that are either fully open or fully closed, control valves modulate continuously to hold a process at a precise setpoint.
Components of a Control Valve Assembly:
Valve body - houses the flow passage and closure member
Trim - the internal parts (plug, seat, cage) that determine flow characteristics
Actuator - pneumatic, electric, or hydraulic device that positions the valve stem
Positioner - converts a control signal into precise actuator/stem position
Valve stem - connects the actuator to the trim
Packing - seals the stem against process fluid leakage
Types of Control Valves We Manufacture:
Control Valve Actuation Methods:
Pneumatic Control Valve Actuators
Use compressed air to position the valve stem, offering fast response and simple fail safe (spring return) configurations for critical process shutdown scenarios.
Electric Control Valve Actuators
Use an electric motor to position the valve stem, suited to remote locations without a compressed air supply or where precise digital positioning feedback is required.
Hydraulic Control Valve Actuators
Use pressurized fluid to generate high actuation force, typically specified for large valve sizes or high-torque applications.
Allow operators to manually position the valve during power or air supply loss, maintenance, or commissioning.
Materials Used in Control Valve Construction:
Stainless Steel Control Valves
Used for corrosion resistance in chemical, high purity, and sour service applications.
Carbon Steel Control Valves
Used for standard industrial process service where cost efficiency is a priority over corrosion resistance.
Alloy and Exotic Metal Options
Materials such as Hastelloy, Monel, and duplex stainless steel are used for highly corrosive or high temperature process conditions.
Control Valve Sizing and Specifications:
Cv and Flow Coefficient Calculations
The flow coefficient (Cv) expresses how much flow a valve passes at a given pressure drop, and is the primary factor in selecting the correct valve size for a process application.
Pressure Drop and Rangeability
Rangeability describes the ratio between the maximum and minimum controllable flow a valve can accurately regulate, while pressure drop across the valve affects both sizing and cavitation risk.
Standard offerings typically span 1/2" through 24" nominal pipe size, with custom sizing available for larger process lines.
Pressure and Temperature Ratings
Control valve pressure classes commonly range from 150 to 2500 ANSI class, with temperature ratings dependent on body material and trim, typically from -20°F up to 1000°F for specialized high temperature designs.
Control Valve Standards and Ratings:
ANSI/ISA Standards Compliance
Control valves are commonly designed and tested to ANSI B16.34 pressure temperature ratings and ISA standards governing control valve sizing, testing, and performance terminology.
NACE Compliance for Corrosive Service
NACE MR0175/ISO 15156 compliance addresses material requirements for control valves in sour (H2S-containing) oil and gas service.
Fugitive Emissions Certification (ISO 15848)
ISO 15848 certification verifies that a control valve's stem packing and sealing design limit fugitive emissions, a requirement increasingly specified in emissions regulated process plants.
Control Valve Trim and Characteristics:
1)Linear, Equal Percentage, and Quick Opening Trim
Linear trim produces flow changes proportional to stem travel. Equal percentage trim produces larger flow changes at higher openings, suited to systems with varying pressure drop. Quick opening trim delivers most of its flow capacity early in stem travel, suited to on/off-style applications needing fast response.
2)Anti Cavitation and Noise Reduction Trim
Specialized multi stage trim designs reduce cavitation damage and aerodynamic noise in high pressure drop applications by breaking pressure reduction into smaller stages.
3)Trim Material Selection
Trim materials are selected based on process fluid corrosiveness, erosive solids content, and temperature, with hardened alloys used in high wear or cavitating service.
Control Valve Accessories:
1)Positioners
Convert a control signal into a precise valve stem position, forming the core of accurate modulating control.
2)I/P Transducers
Convert an electronic control signal (current) into a pneumatic signal (pressure) to operate pneumatic control valve actuators.
3)Limit Switches and Position Transmitters
Provide feedback on valve position to a control system for monitoring and diagnostics.
4)Solenoid Valves
Direct air supply to pneumatic actuators for fail-safe shutdown or emergency valve positioning.
End Connection Options:
