Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
| Payment Terms | Western Union,T/T,D/P,D/A,L/C |
| Supply Ability | 100 |
| Delivery Date | 5 days |
| Maximum Pressure | 315 bar |
| Maxpressure | 350 bar |
| Speed | Hydraulic oil, water ethylene glycol |
| Packaging Details | wooden box |
| Certifisaarion | ISO9001 |
| Delivery Time | 2 weeks |
| Material | High-grade steel and aluminum |
| Certifiion | ISO |
| Place of Origin | Germany |
| Brand Name | Rexroth |
| Model Number | LC25DB20A7X/ |
View Detail Information
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Product Specification
| Payment Terms | Western Union,T/T,D/P,D/A,L/C | Supply Ability | 100 |
| Delivery Date | 5 days | Maximum Pressure | 315 bar |
| Maxpressure | 350 bar | Speed | Hydraulic oil, water ethylene glycol |
| Packaging Details | wooden box | Certifisaarion | ISO9001 |
| Delivery Time | 2 weeks | Material | High-grade steel and aluminum |
| Certifiion | ISO | Place of Origin | Germany |
| Brand Name | Rexroth | Model Number | LC25DB20A7X/ |
| High Light | Rexroth hydraulic plug-in valve ，LC25DB20A7X hydraulic valve ，German-made Rexroth valve | ||
|
Parameter |
Description / Value |
|---|---|
|
Manufacturer & Model |
Rexroth, Series LC/LCx (Plug-in Cartridge) |
|
Part Number |
R900933726 |
|
Variant |
LC25DB20A7X |
|
Function |
Pilot-Operated Check Valve (Logic Element) |
|
Valve Type |
Screw-in, plug-in cartridge valve (2-way, poppet type) |
|
Size Code |
25 (NG10 size cavity) |
|
Cavity Standard |
ISO 7368 (Standard cavity for size 25) |
|
Thread |
1-5/16" - 12 UN (typical for Size 25) |
|
Configuration |
2-port (A, B) poppet-type logic cartridge. Acts as a pilot-operated check valve. Allows free flow from A→B, blocks flow from B→A unless pilot pressure is applied. |
|
Pilot Control |
Internal or external pilot for opening. "A7X" code indies a specific pilot ratio and control option. |
|
Pilot Ratio |
Defined by "A7X" code. The "A" typically denotes a specific pilot ratio (e.g., 3:1 or 4:1). The exact ratio for A7X must be confirmed via the datasheet. |
|
Max. Operating Pressure |
Up to 350 bar (system dependent; confirm with manifold specs) |
|
Max. Flow Rate |
High (dependent on pressure drop). For Size 25 (NG10), flow can be 300-400 L/min or more. Consult Cv or flow curves. |
|
Leakage (Blocked) |
Virtually zero (metal-to-metal or soft-seated poppet design) |
|
Seals |
Standard seal material is implied. Specific material (e.g., NBR, FKM) may be defined by an optional suffix; consult datasheet. |
|
Fluid Compatibility |
Mineral-based hydraulic oils (HL, HLP) to ISO 11158. |
|
Operating Temperature |
-20°C to +80°C (with standard seals) |
|
Cracking Pressure |
Very low, typically < 1 bar for free flow direction (A→B). |
|
Appliion |
Used as a high-flow hydraulic "lock" or load-holding valve. Prevents actuator movement under load by blocking flow from B→A. Can be opened by applying pilot pressure to allow controlled movement. Essential for safety in high-flow appliions like large presses, plastic machines, and heavy mobile equipment. |
|
Cavity Requirement |
Must be installed in a correctly machined ISO 7368 Size 25 cavity (e.g., LC..-25). The cavity design is critical for function and pressure rating. |
|
Standards |
ISO 7368 (Cavity dimensions) |
| R900924388 LC25B40E7X/V |
| R900925274 LC32A05E7X/V |
| R900925950 LC16A05D7X/V |
| R900926306 LC40B00E7X |
| R900926717 LC25A40D7X/V |
| R900927010 LC32B05D7X/V |
| R900927012 LC32B05E7X/V |
| R900927154 LC16DB30A7X |
| R900927969 LC40DB40E7X |
| R900927973 LC40A40E7X |
| R900928456 LC16A05E7X/V |
| R900928559 LC25A40E7X/V |
| R900928560 LC25DB40E7X/V |
| R900928566 LC32B40E7X/V |
| R900928821 LC40DB20D7X |
| R900928823 LC50B40E7X |
| R900928826 LC63A20E7X |
| R900929152 LC25DB00E7X/V |
| R900929153 LC32A00E7X/V |
| R900929381 LC25B00E7X/V |
| R900929382 LC25A10E7X/V |
| R900929665 LC50B20E7X |
| R900929795 LC80A40E6X/V |
| R900929926 LC32A40E7X/V |
| R900929929 LC32A20E7X/V |
| R900929931 LC32DB40E7X/V |
| R900929935 LC50A40E7X |
| R900929940 LC63B40E7X |
| R900930441 LC16A20D7X/V |
| R900930559 LC16DB80D7X/V |
| R900931262 LC16A40D7X/V |
| R900931361 LC16A10E7X/V |
| R900932074 LC16DB20E7X/V |
| R900932338 LC32DB00D7X |
| R900932339 LC32DB00E7X |
Q1: What is the core function of this specific cartridge?
A: This is a pilot-operated check valve, commonly called a logic cartridge. Its primary functions are to allow free flow in one direction (A→B), provide a leak-tight block in the opposite direction (B→A) to hold a load, and be opened in the blocking direction via an external pilot pressure signal. It is a fundamental component for load-holding and safety in hydraulic systems.
Q2: What is the significance of the "Size 25" designation?
A: "Size 25" refers to the ISO 7368 standard cartridge size, which corresponds to a nominal NG10 port size. This indies a larger, high-flow-capacity cartridge compared to smaller sizes like Size 16 (NG6) or Size 10. It requires a correspondingly larger threaded cavity and is designed for systems with high flow demands, potentially handling 300-400 L/min or more.
Q3: What does the code "LC25DB20A7X" specifically mean?
A: This is a structured part code:
LC: Product family for screw-in cartridge logic elements.
25: The ISO Size, determining the physical dimensions and thread (typically 1-5/16" - 12 UN).
DB20: Denotes the specific internal sleeve and poppet configuration, defining flow paths and internal geometry.
A7X: The most critical performance code. The letter "A" defines the pilot control ratio (e.g., 3:1, 4:1). The "7X" defines the pilot control and damping characteristics. You must consult the datasheet for the exact meaning of A7X to correctly size the pilot system.
Q4: What is a "pilot ratio" and how do I determine it for this valve?
A: The pilot ratio is a key design parameter. It is the ratio of the effective area on which the load pressure (at port B) acts to the area of the pilot piston. A ratio of 4:1 (A=4) means that to open the valve against a 400 bar load pressure at port B, you would need 400/4 = 100 bar of pilot pressure. The "A" in A7X specifies this ratio. Using the wrong ratio can result in a valve that cannot be opened or requires excessively high pilot pressure.
Q5: How and where is this valve installed?
A: It is a screw-in cartridge. It must be installed into a precision-machined ISO 7368 Size 25 cavity within a manifold block, cylinder port, or custom valve body. Installation requires a specific cartridge wrench and a defined tightening torque. It is not a standalone valve and cannot be used without the correct cavity.
Company Details
Business Type:
Manufacturer,Exporter
Total Annual:
1 million-10 millon
Employee Number:
>50
Ecer Certification：
Verified Supplier
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha... Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha...
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