Yuken SRG SRCG SRT SRCT Series Check & Throttle Valve | SRCT-03 SRG-06 SRG-10 | Flow Control

Chengyuan Hydraulic presents the SRG, SRCG, SRT, and SRCT Series valves, precision-engineered as premium replacements for Yuken industrial standards. This versatile series integrates both throttling and check functions, available in sub-plate mounting (SRG/SRCG) and threaded pipe connections (SRT/SRCT). Core models include SRCT-03-10, SRG-06-50, and SRG-10-50. As a pivotal component for speed regulation in hydraulic actuators, Chengyuan ensures 100% Drop-in Interchangeability regarding mounting patterns, adjustment screw precision, and internal flow path layouts compared to original Yuken products. Backed by our 100% Simulation Load Testing, each valve is verified for flow linearity and reverse sealing integrity, ensuring smooth speed control for injection molding machines, machine tools, and industrial presses.

Technical Specifications 

• Series Category: SRG/SRCG (Sub-plate), SRT/SRCT (Threaded)

• Nominal Sizes: 03 (3/8″), 06 (3/4″), 10 (1-1/4″)

• Max Operating Pressure: 250 bar (25 MPa)

• Max Flow Rate: Size 03 (Up to 40 L/min), Size 06 (Up to 125 L/min), Size 10 (Up to 250 L/min)

• Check Valve Cracking Pressure: 0.4 bar (Standard), 2 bar, or 5 bar optional

• Adjustment Method: Manual knob or adjustment screw with lock nut

• Working Medium: Mineral oil or phosphate ester fire-resistant fluids

• Sealing Material: NBR (Buna-N) or FKM (Viton)

Key Technical Advantages:

• Precision-Ground Needle Valve: The throttle needle is crafted from high-hardness alloy steel and super-finished to provide excellent flow linearity. This ensures stable oil output even at minimal openings, effectively preventing actuator “crawling” at low speeds.

• High-Reliability Check Mechanism: The internal check poppet is specifically hardened and paired with a precision-ground seat. It offers superior sealing integrity during reverse cutoff with minimal pressure drop and rapid response.

• Vibration-Resistant Design: The adjustment mechanism is equipped with a reliable locking device. This maintains constant flow settings even under high-frequency mechanical vibration or pressure pulsations, preventing speed drift.

• Durable Casting Body: Utilizing a high-strength precision casting process, the internal channels are smooth and free of defects. This reduces noise generated by turbulence and local heating, extending the overall service life of the valve.

Application Areas:

• Machine Tools: Precise speed regulation for hydraulic feed systems.

• Injection Molding: Smooth deceleration control for clamping and injection actions.

• Industrial Presses: Controlling backpressure and descent speed in rapid-down circuits.

• Heavy-Duty Conveyors: Smoothing the startup and braking speeds of hydraulic motors.

Expert Maintenance Tips:

• Adjustment Logic: Turning the knob clockwise decreases flow (reduces speed), while counter-clockwise increases flow (enhances speed). Always tighten the lock nut after adjustment.

• Mounting Orientation: For SRCT/SRT threaded models, strictly verify the oil flow direction based on the arrow on the valve body (Check valve for free reverse flow).

• Oil Quality Management: To prevent needle wear and adjustment failure, maintain system filtration around 25μm and regularly monitor the acidity and viscosity of the hydraulic oil.