Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of hydraulic pilot operated check valve z2s6 in China, also supports customized service. If you're going to wholesale high quality hydraulic pilot operated check valve z2s6 made in China, welcome to get pricelist from our factory.
Products Description
Basic Specifications
The hydraulic pilot operated check valve Z2S6 is a sandwich-plate type pilot-operated check valve with a nominal size of NG6; its mounting interface complies with ISO 4401-03 and DIN 24340 standards. It features a maximum operating pressure of 315 bar and a rated flow rate of 60 L/min. Opening pressure options include 0.15, 0.3, and 0.7 bar. Sealing configurations are available for either dual-port (A/B) or single-port sealing, with seal materials of NBR (for mineral oil) or FKM (for phosphate esters). A pre-opening function is optionally available. The operating temperature range is -30°C to 80°C for NBR seals.
Product Advantages
The poppet-style seat design ensures zero-leakage sealing and reliable long-term pressure holding. Its sandwich-style configuration allows for direct mounting between the directional control valve and the subplate, eliminating the need for extra piping, saving space, and reducing potential leak points. A two-stage pilot structure enables smooth reverse opening even at low pilot pressures. An optional pre-opening feature allows for pressure relief before the main spool opens during reverse flow, preventing pressure shocks. The dual-seal configuration for ports A and B enables independent pressure holding for both lines, offering flexibility to meet diverse circuit requirements.
Applications
Widely used in injection molding machines (clamping circuit pressure holding), hydraulic presses (main cylinder pressure holding), construction machinery (load holding), and mobile equipment (preventing load drop), as well as in any hydraulic circuit requiring zero-leakage pressure holding and reverse flow control. It is particularly suitable for applications requiring prolonged pressure maintenance and the prevention of actuator displacement caused by leakage.
| Product Parameters | ||||
| Specification | 6 | 10 | 16 | 22 |
| Max Working Pressure(bar) | 315 | |||
| Max Flow(L/min) | 60 | 120 | 200 | 360 |
| Opening Pressure | 0.15/0.3/0.7 | 0.15/0.3/0.6 | 0.25 | 0.3/0.5/0.75/1.0 |
| Design Number | 10 | 20 | 30 | 30 |
Company production advantages
The production of the Z2S6 hydraulic pilot operated check valve relies on a complete manufacturing chain and a mature quality control system. Manufacturers typically have high-precision machining centers, CNC lathes, and other advanced equipment. Key processes are CNC-controlled to ensure flow channel accuracy and stable spool clearance.
The core advantages
Precision casting: The valve body is precisely cast using high-strength cast iron material. The structure is dense and free of defects, providing a solid blank for subsequent processing.
High-precision processing: The valve body, valve holes and flow channels are processed by high-precision CNC technology to ensure the mating accuracy with the ISO 4401 installation surface, guaranteeing the sealing reliability during the superimposed installation.
Strict quality control system: From the entry of raw materials into the factory to the shipment of finished products, the quality of each process is tracked throughout the entire process. Inspection checkpoints are set up at each stage to ensure the consistency and reliability of the products.
Mature technology platform: The Z2S6 series adopts a mature stacked design. The installation surface complies with various standards and is fully compatible with mainstream brands.
Manufacturing Process
① Material Preparation and Precision Casting
The valve body is made of high-strength cast iron through a precision casting process. During casting, the alloy temperature, filling speed, and solidification pressure are strictly controlled to ensure the casting is dense-free of porosity and shrinkage defects.
② Precision machining
The cast blanks go through multiple steps on a high-precision machining center-milling the mounting face, drilling oil ports, and finishing valve bores and flow channels. Key dimensions are held to ±0.005mm to ensure a precise fit between the spool and bore. After machining, parts are deburred and cleaned.
③ Part processing and heat treatment
The spool is made from high-quality alloy steel and precision-ground to ensure the right clearance with the valve body bore. Key components are heat-treated as designed to increase surface hardness and wear resistance. After sealing grooves are machined, they go through cleanliness testing.
④ Sealing components selection and assembly
Select seals according to the order spec. Assemble the valve body, spool, pilot piston, return spring, and other parts in a clean environment. The sandwich design makes assembly efficient and consistent.
⑤ Factory performance testing
Before each hydraulic pilot operated check valve Z2S6 is manufactured, it must undergo comprehensive performance verification:
Pressure resistance and leakage test: Verify the strength of the valve body and the sealing performance of each oil port under a pressure of 315 bar, ensuring zero leakage.
Start the pressure test: Verify whether the three pressure levels of 0.15/0.3/0.7 bar meet the standards.
Preliminary functional test: Verification of the reliability and response time of the hydraulic reverse opening function
Flow performance test: Verify the pressure drop and flow capacity at the rated flow rate of 60 L/min.
⑥ Packaging and Delivery
After passing inspection, the oil ports are sealed with dust plugs, and the valve is packed in standard cartons or wooden boxes. It's then shipped to customers worldwide by sea, air, or courier.
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FAQ
Q: What is the Z2S6 valve? What is its main function?
A: The Z2S6 is a sandwich-style pilot-operated check valve. It provides leak-free pressure holding at actuator ports, prevents reverse flow, and enables safe circuit unloading. It's ideal for applications that need long-term pressure retention and must prevent actuator movement from leakage.
Q: What is the function of the pre-opening structure?
A: The pre-opening feature opens a small ball valve first for pressure relief before opening the main cone spool-avoiding the shock from sudden high-pressure release. It's suited for high-pressure circuits that need smooth unloading.
Q: The system has lost its pressure. Could it be a problem with the Z2S6?
A: Maybe. Pressure loss could be caused by wear on the spool sealing surface, leaking cylinder seals, pipe connections, or internal leakage in the directional valve.
Q: After the overlay installation, there is oil leakage. What's the reason?
A: It could be that the seal isn't seated flat or is twisted, bolt torque is insufficient or uneven, the mounting surface has dirt or scratches, or the seal is aged.
Q: Can the hydraulic pilot operated check valve Z2S6 be used in high-frequency switching circuits?
A: The Z2S6 is a hydraulic pilot operated check valve-built for holding pressure and locking loads, not for constant reversing. Frequent shifting means the cone spool keeps banging against the seat, and the sealing surface wears out quickly.
Q: When the Z2S6 is in reverse cutoff mode, the leakage current increases. What is the reason for this?
A: The sealing surfaces of the cone spool and valve seat are worn or scratched-usually from contaminated oil with particles scoring the sealing faces. Replace the cone spool and seat assembly, and check the oil cleanliness.
Q: When the hydraulic pilot operated check valve Z2S6 is operated in reverse, there is abnormal noise or shock. How to solve this problem?
A: It might be that pilot pressure comes on suddenly, causing the cone spool to open fast, or there's air in the system, or the pre-opening option wasn't selected. Check the pilot pressure ramp rate, bleed the system, and if shocks happen often, choose a model with pre-opening.
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