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EF(C)G-03/06-51 Flow Control and Check Valves

更新时间：2026-05-05 11:23:23

EF(C)G-03/06-51 is a high-performance hydraulic control component integrating flow control and check functions, produced by Japan YUKEN Corporation. Essentially, it is a combination of two EF(C)G series valves with different specifications (EF(C)G-03-51 and EF(C)G-06-51). Its core function is to precisely control the flow rate of the hydraulic system while preventing the backflow of hydraulic oil, with the characteristics of stable performance, reliable sealing and strong anti-interference ability, and it is widely used in hydraulic systems that require unidirectional flow control and backflow prevention.

I. Model Parameter Interpretation

In this composite model, each part of the code corresponds to the core specifications of the valve. The specific interpretation is as follows, combined with industry standards and YUKEN product specifications:

Model Segment	Code Meaning	Specific Parameters
EF(C)G	Series Name	Flow control and check compound valve, integrating flow regulation and one-way backflow prevention functions, composed of a flow control valve core, check valve core, and high-precision control components, where "C" represents the check function.
03/06	Nominal Size (Port Diameter)	03: Corresponding to G1/4 port (10 port diameter); 06: Corresponding to 3/4” port, which determines the flow range and installation specifications of the valve, adapting to different hydraulic system pipeline requirements.
51	Seal Specification	Fluororubber seal, suitable for high-temperature and environmentally friendly oil working conditions, ensuring the sealing performance of the valve, preventing oil leakage, and extending the service life of the valve. It is a commonly used seal specification in YUKEN hydraulic valves.

II. Core Technical Parameters (by Specification)

The two combined valves share the core technical characteristics of the EF(C)G series, and only differ in parameters such as nominal size, flow rate and weight. The specific parameters are summarized below (refer to YUKEN official standard parameters):

Specification Model	Maximum Working Pressure	Flow Adjustment Range	Installation Method	Weight	Core Control Parameters
EF(C)G-03-51	25MPa (250kgf/cm²)	1~80L/min	Plate Mounting (CETOP-3 Standard)	14kg	Flow Control: Rated Current 650mA, Coil Resistance 45Ω; Check Function: Backflow Prevention Pressure ≥0.1MPa, Response Time ≤5ms, ensuring rapid and reliable backflow prevention.
EF(C)G-06-51	25MPa (250kgf/cm²)	2~150L/min	Plate Mounting	30kg	Flow Control: Rated Current 720mA, Coil Resistance 42Ω; Check Function: Backflow Prevention Pressure ≥0.1MPa, Response Time ≤5ms, suitable for medium-flow hydraulic systems requiring backflow prevention.

Supplementary Note: Both valves have the characteristics of small flow control hysteresis (<6%) and high repeatability (≤1%). The check function adopts a poppet-type structure, which has good sealing performance and can effectively prevent hydraulic oil backflow and system pressure loss. It is recommended to use with supporting filters to avoid impurities affecting the valve core action.

III. Core Structure and Functional Characteristics

1. Core Structure

Each valve is composed of three core components: the first is a precision flow control valve core, which is responsible for adjusting the flow rate of hydraulic oil according to the input signal to achieve stable flow output; the second is a poppet-type check valve core, which is responsible for preventing hydraulic oil backflow—fluid can only flow along the water inlet, and the medium at the water outlet cannot flow back; the third is a high-strength valve body, made of high-strength cast iron material, which can withstand instantaneous pressure impact and is suitable for continuous heavy-load working conditions. The overall modular design is convenient for system integration and later maintenance, and the internal channel is optimized to reduce flow resistance and energy loss.

上一篇：EFBG-03-125-61/06-250-61/10-500-51 Flow Control and Relief Valves