Product Overview

Models such as F200, F400, F600, F800, F1200, F1600, F2000 and F2400 belong to the Parker F series (Manatrol) throttle check valves. Featuring a precision needle throttle with integral check valve, they provide accurate flow control in one direction and free flow in the reverse direction. Every unit undergoes rigorous 100% simulated operating-condition testing and offers excellent drop-in interchangeability with equivalent in-line throttle check valves. The two-stage needle design delivers fine adjustment capability, making them ideal for medium-to-high-pressure hydraulic systems requiring precise speed control.

Technical Specifications 

• Model examples: F200, F400, F600, F800, F1200, F1600, F2000, F2400
• Valve type: In-line throttle check valve (needle + check)
• Port sizes: 1/8″ to 1½” (depending on model)
• Maximum operating pressure: Steel 350 bar (sizes F200–F800); 210 bar (larger sizes)
• Maximum flow (approx.): F200 11 L/min; F400 25 L/min; F600 40 L/min; F800 50–57 L/min; F1200 95–120 L/min; F1600 151–250 L/min
• Cracking pressure: approx. 0.4 bar
• Adjustment: Two-stage needle (fine control in first three turns)
• Body material: Steel, brass or stainless steel
• Seal material: NBR or FKM
• Operating temperature: –40 °C to +121 °C (NBR)

Key Technical Advantages

1. Two-stage needle fine adjustment: First three turns provide precise low-flow control, followed by rapid full opening for wide range and excellent repeatability.
2. Integral free-flow check: Low resistance in reverse direction supports fast actuator return.
3. Excellent drop-in interchangeability: Standard pipe-thread ports allow direct replacement of equivalent Parker or other brand throttle check valves, minimizing modification costs.
4. High pressure and material options: Steel versions rated to 350 bar; brass and stainless steel options available for different fluids and environments.
5. Compact and reliable design: Simple construction, easy maintenance and long-term operational stability.

Application Areas

Injection moulding machines, die-casting machines, machine-tool hydraulics, packaging machinery, automation equipment, mobile machinery and other medium-to-high-pressure circuits requiring precise one-way flow control.

Expert Maintenance Tips

1. Ensure threads are clean and seals are intact before installation; use appropriate sealant or gaskets and tighten to the recommended torque.
2. Maintain recommended fluid cleanliness; use hydraulic fluids compatible with the installed seal material.
3. Adjust flow slowly by turning the adjustment knob; lock with the set screw after setting to prevent vibration loosening.
4. Periodically inspect the valve body for external leakage; clean and protect threads and sealing surfaces during long-term storage.
5. Do not exceed pressure ratings or disassemble internal needle components. Repairs should be performed only by experienced technicians.