YYS08-00 Hydraulic Lock Threaded Cartridge Valve

YYS08-00 Hydraulic Lock Threaded Cartridge Valve

2 month ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

YYS08-00 Bi-directional Hydraulic Lock Threaded Cartridge Valve

1. Product Overview

YYS08-00 is a standard 08-port threaded cartridge bi-directional pilot-operated check valve (hydraulic lock), integrating two independent pilot check valves in one compact screw-in body. It is designed for double-chamber synchronous locking of hydraulic cylinders, to prevent load-induced drifting, accidental falling and position shifting when the system loses pressure. Widely adopted for excavator outriggers, aerial work platforms, forklift lifting mechanisms, tunneling machinery support cylinders and compact hydraulic power packs for reliable long-term load holding protection。

YYS08-00 Hydraulic Lock Threaded Cartridge Valve is a high-performance bidirectional locking Hydraulic valve. As a screw-in CARTRIDGE VALVE, it serves as a critical safety control component in the hydraulic system. This threaded CARTRIDGE VALVE can be directly mounted into integrated manifold blocks, simplifying piping layout and making the entire hydraulic system more compact. This Hydraulic valve effectively locks the oil circuit to maintain the position of actuators, preventing unexpected movement and enhancing operational safety of the hydraulic system.

2. Core Technical Specifications

Parameter Specification

Mounting Cavity Standard 08-size threaded cartridge hole (3/4-16UNF thread)

Nominal Working Pressure 21 MPa, max withstand pressure up to 35 MPa

Rated Max Flow 30 L/min

Standard Pilot Ratio ~7:1 (low pilot pressure to open reverse passage)

Seal Material Nitrile rubber (NBR, oil-resistant & anti-aging)

Compatible Fluid ISO VG32 / VG46 anti-wear mineral hydraulic oil

Operating Temperature -20℃ ~ 80℃

Internal Leakage Near zero via poppet hard seal for stable long-duration pressure retention

Installation Direct screw-in mounting for standard 08-series integrated manifolds

3. Working Principle

1. Locked idle state: No pressure supplied to either control port, dual poppets are pressed tightly against seats by springs and load pressure. Both oil passages are fully sealed, locking the cylinder at a fixed position to eliminate gravity-driven sinking or drifting。

2. Cylinder extending (forward flow): Pressure oil feeds into one chamber, pushing the local poppet open for oil inflow; meanwhile, partial pressurized oil acts as pilot pressure to pry open the opposite poppet, enabling smooth return flow from the other cylinder chamber.

3. Cylinder retracting: The hydraulic control logic reverses symmetrically for stable two-way actuation; once inlet pressure cuts off, both poppets reset instantly to re-lock the cylinder双腔油路。

4. Key Advantages

1. Integrated screw-in structure saves manifold space, simplifies pipeline layout for compact hydraulic circuits

2. Precision cone poppet hard sealing delivers ultra-low internal leakage, ideal for long-time heavy load holding scenarios

3. Optimized 7:1 pilot ratio requires low unlocking pressure, ensuring smooth cylinder start/stop without impact or jitter

4. Hardened valve core resists abrasion and vibration, adapts to harsh construction, mining and warehouse operating environments

5. Universal 08 standard cavity is interchangeable with mainstream insert valves for easy field replacement and maintenance

5. Typical Application Scenarios

- Anti-drop locking for crane / mini excavator outrigger cylinders

- Position retention for aerial work platform and scissor lift lifting cylinders

- Safety protection for forklift, stacker and tunneling machinery support hydraulic loops

- Double-chamber synchronous lock for small industrial hydraulic station actuators

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

4 year

Address: Ningbo, China

Main Product: hydraulic motor, gear box, hydraulic pump , hydraulic valve , hydraulic winch, hydraulic system

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