Z2S Check Valve OVERVIEW

Features and Benefits

• Zero-leakage Holding Performance: Precision poppet sealing structure realizes near-zero internal leakage, supporting long-term static pressure maintenance and stable load holding without position deviation.

• Standard Sandwich Installation: ISO 4401 standard stacked design requires no extra piping, easy to assemble, disassemble and combine with other stacked valves, saving installation space.

• Sensitive Pilot Control: Low pilot opening pressure, flexible and reliable reverse flow release, ensuring smooth and rapid cylinder reset and retraction actions.

• Durable & Stable Structure: Hardened precision valve core and wear-resistant sealing components resist fatigue and impact, delivering stable performance under long-term high-pressure working conditions and extending service life.

• Strong Compatibility: Multiple specifications and flow rates are available, fully compatible with mainstream hydraulic systems, adaptable to diverse industrial and mobile hydraulic working conditions.

Specifications Z2S Check Valve

Valve Type: Sandwich‑mounted pilot‑operated hydraulic check valve (hydraulic lock)
Mounting Standard: ISO 4401 modular sandwich installation
Max. working pressure: 315 bar 

Nominal sizes: 6, 10, 16, 22
Max. flow rate: 60 L/min (size6), 120 L/min (size10), 300 L/min (size16), 450 L/min (size22)
Cracking pressure (free‑flow direction): 1.5 bar / 3 bar / 5 bar / 7.5 bar /10 bar optional
Pilot area ratio: 1:3 / 1:4.5 optional
Internal leakage: Near‑zero leakage for static holding
Hydraulic fluid: Mineral‑based hydraulic oil (NBR seals); FKM seals available for special media
Viscosity range: 2.8‑500 mm²/s
Fluid temperature: -30℃ ~ +80℃ (NBR seals); -20℃ ~ +80℃ (FKM seals)
Fluid cleanliness requirement: ISO 4406 20/18/15
Weight: 1.8‑7.2 kg, varies by nominal size

Applications

• Z2S Check Valve is widely used in hydraulic circuits requiring reliable position‑locking and anti‑sinking protection.

• It is suitable for lifting platforms, aerial work platforms, truck‑mounted cranes and various mobile construction machinery.

• Also applied for machine‑tool hydraulic clamping fixtures, hydraulic presses and automated industrial equipment.

• This modular valve prevents cylinder drifting and load dropping under static condition, ensuring system operation safety.

Packaging & Delivery

Z2S Check Valve are typically packaged securely to prevent damage during transit. The packaging includes:

Protective Wrapping: To safeguard the pump from environmental damage.

Custom Crates: For larger, heavier pumps, ensuring safe handling.

Documentation: Includes installation, maintenance instructions, and warranty details.

Delivery time depends on the model, customizations, and location but typically ranges from 2 to 6 weeks from the order date.

Z2S Check Valve FAQ:

1. What is the Z2S Check Valve ?

Z2S Check Valve is a sandwich‑type pilot‑operated hydraulic check valve, also called hydraulic lock. Following ISO 4401 stacking standard, it allows free one‑way flow and blocks reverse flow with near‑zero leakage. It locks cylinder position and avoids load sinking, while reverse flow can be opened by pilot pressure for cylinder movement. It serves as a safety component for load‑holding hydraulic circuits.

2. What makes the Z2S Check Valve ?

It delivers near‑zero internal leakage for reliable long‑time load‑holding performance. ISO‑standard sub‑plate mounting ensures easy installation and quick field replacement. Sensitive pilot control works with low pilot pressure to open reverse passage smoothly. Compact integrated structure saves installation space inside hydraulic power units. Hardened valve core reduces wear and extends service life under heavy‑load conditions. Multiple pilot pressure ratios and flow sizes are available for different system demands.

3. What is the working pressure range of Z2S Check Valve ?

Its maximum working pressure is 315 bar. Recommended operating pressure ranges from 7 bar to 315 bar. Please select the proper model according to your actual system pressure and flow requirements.

4. Can Z2S Check Valve replace other brands?

7. How can I get a quotation quickly

Please provide the following details:

• Model or displacement

• Working pressure

• Speed

• Quantity
  We will reply within 12 hours with a competitive quotation.

  
  

Certifications & Quality Assurance

Z2S Check Valve are manufactured in compliance with international standards, ensuring high performance and reliability:

ISO 9001: Certified for quality management systems.

CE Certification: Ensures compliance with European safety, health, and environmental protection standards.

RoHS Compliance: Ensures the pump does not contain hazardous materials.

Factory Testing: Every pump is rigorously tested for performance, pressure, and leak integrity before shipping.

FAQ

1.What's our advantages?

Factory established in 2005;

With a great deal of production experience;

80+ employees become the professional team;

Constant updated ERP system ensure efficiency of work;

Sophisticated equipment ehanced the accuracy of products;

Professional salesmen provide the greast service;

With a large number of famous customers all over the world;

Great after-sales service;

With the long term cooperation with famous logistics and express company in China,provide the better goods service.

2.What is your payment terms?

Small order/sample order,full payment in advance; Big orders send the first payment 30% before the production,and the balance before shippment.We'll show the photos of the products and packages before delivery.

3.Can you make my own brand on the products?

Of course we can. Just send me your logo  we can make it for you.

4.What is our main export market?

America(40.5%):USA, Canada, Argentina, Brazil

Europe(30.8%):Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.

Asia(23.5%):Korea,singapore,India,Turkey,Vietnam,Saudi Arabia,Syria, Israel,Lebanon.

Others(5.8%).

The Green hydraulic pump manufacturing facility is a specialized industrial plant that focuses on producing hydraulic pumps and related components. These factories are equipped with advanced machinery and technology to fabricate high-quality pumps designed for a wide range of applications, from heavy equipment and machinery to automotive and industrial systems.

The production process typically involves precision engineering, where raw materials like metals and alloys are processed into pump components such as gears, pistons, cylinders, and seals. These parts are then assembled into fully functional hydraulic pumps, which are tested for performance and quality control to ensure reliability, efficiency, and durability under various working conditions.