Throttle Valves

Fokca flow control valves are essential components for cylinder speed control. With a precision needle valve design, they allow stepless adjustment of extension and retraction speeds, reducing end impact, extending equipment life, and improving efficiency.

Featuring a one-way sealing structure, they support both inlet and exhaust throttling, meeting the needs of single-acting and double-acting cylinders in various applications.

Available in nickel-plated brass with plastic and stainless steel options, Fokca valves support G, R, and NPT threads, with tube sizes from 4 mm to 16 mm—ensuring broad compatibility and offering solutions from economical to high-performance speed control.

Why Choose a Flow Control Valve?

In pneumatic systems, cylinders without proper speed control often face the following issues: excessively fast extension or retraction, strong end-of-stroke impact causing vibration and noise, and reduced mechanical lifespan. On the other hand, overly slow movement can negatively affect cycle time and reduce productivity.

A flow control valve is the key component that resolves this contradiction. By precisely regulating cylinder speed, it enables smooth start-up, stable motion, and gentle stopping—ensuring efficient and reliable operation of equipment.

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By adjusting the airflow rate, a flow control valve provides precise control of cylinder speed and delivers three core benefits:

· Adjustable speed: freely set according to process requirements

· Reduced impact: smooth cushioning at the end position, extending equipment life

· Improved efficiency: optimized cycle time and increased productivity

Whether for single-acting or double-acting cylinders, and whether fast movement or slow feed is required, flow control valves offer an ideal solution.

Fokca Flow Control Valve Series Overview

Series	Material	Structure	Application
SC Series	Nickel-plated brass + PBT + NBR seal	Thread + tube	General automation, cylinder-mounted installation
SU Series	Nickel-plated brass + PBT + NBR seal	Tube + tube	Inline speed control, applications with sufficient space
SSC Series	Stainless steel + FKM seal	Thread + tube	Food & pharmaceutical, humid/corrosive, high-temperature environments
SSU Series	Stainless steel + FKM seal	Tube + tube	Inline control in corrosive environments

Note: Thread types include BSPP (G), BSPT (R), and NPT standards. Thread sizes range from M5, G1/8, G1/4, G3/8, to G1/2. Tube outer diameters range from 4 mm to 16 mm, compatible with various cylinders and solenoid valve ports.

Exhaust Throttle control vs. Inlet Throttle control

· Exhaust throttle control: Free inflow with adjustable exhaust flow. This is the standard method for cylinder speed control, offering smooth and stable operation. Suitable for most double-acting cylinder applications.

· Inlet throttle control: Adjustable inflow with free exhaust. Suitable for single-acting cylinders or special applications requiring inlet-side speed control.

Installation and Usage Guidelines

· Installation direction: Pay attention to the flow direction arrow on the valve body and ensure the airflow matches the indicated direction. Exhaust throttling valves have a one-way function; incorrect installation may result in no speed control or blocked airflow.

· Adjustment method: Turn the knob clockwise to reduce flow (slower speed), and counterclockwise to increase flow (faster speed). Adjust gradually while observing cylinder movement.

· Initial setting: For first use, it is recommended to fully close the valve and then slowly open it to avoid sudden high-speed cylinder movement and impact.

· Installation position: For precise speed control, it is recommended to use an exhaust throttling type and install it at the cylinder exhaust port to achieve more stable performance.

· Regular inspection: After long-term use, if adjustment becomes ineffective or speed unstable, it may be due to needle valve wear or seal aging. Replacement is recommended.

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