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제품 상세 정보:
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| 재료: | 고급 강철 및 알루미늄 | 최대 압력: | 315바 |
|---|---|---|---|
| 속도: | 유압 오일, 물 에틸렌 글리콜 | 인증서: | ISO9001 |
| 배송일: | 5일 | 최대 압력: | 350 바 |
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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) |
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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 indicates a specific pilot ratio and control option. |
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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. |
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Leakage (Blocked) |
Virtually zero (metal-to-metal or soft-seated poppet design) |
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Seals |
Standard seal material is implied. Specific material (e.g., NBR, FKM) may be defined by an optional suffix; consult datasheet. |
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Fluid Compatibility |
Mineral-based hydraulic oils (HL, HLP) to ISO 11158. |
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Operating Temperature |
-20°C to +80°C (with standard seals) |
|
Cracking Pressure |
Very low, typically < 1 bar for free flow direction (A→B). |
|
Application |
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 applications like large presses, plastic machines, and heavy mobile equipment. |
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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. |
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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 indicates 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.
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