Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of z2s10 modular hydraulic check valve in China, also supports customized service. If you're going to wholesale high quality z2s10 modular hydraulic check valve made in China, welcome to get pricelist from our factory.
Products Description
The Z2S10 modular hydraulic check valve is an NG10-size sandwich-style pilot-operated check valve, featuring a maximum operating pressure of 315 bar and a maximum flow rate of 120 L/min. Its sandwich design allows for direct installation between a directional control valve and the subplate, saving space and simplifying piping.
The valve provides leak-free sealing for one or both working ports, ensuring long-term pressure holding and high stability. Fluid flows freely from A1 to A2 or B1 to B2, while flow in the opposite direction is blocked; however, the check valve can be opened via pilot control pressure to allow reverse flow. Four cracking pressure options are available (1.5, 3, 6, and 10 bar), and the operating temperature range is -30°C to 80°C.
It is suitable for hydraulic circuits in construction machinery, injection molding machines, presses, and metallurgical equipment where prolonged pressure holding is required to prevent actuator displacement caused by leakage.
Working Principle
Forward Flow (Fluid entering port A/B): When fluid flows from the directional control valve to port A1 (or B1) of the Z2S10 valve, the fluid pressure directly forces the ball within the valve poppet off its seat, allowing fluid to flow freely to port A2 (or B2) and into the actuator.
Reverse Flow (Blocking and Opening): There are two scenarios for reverse flow from A2 (or B2) to A1 (or B1):
Reverse Blocking: In the absence of pilot control pressure, spring force holds the valve poppet firmly against its seat, blocking the reverse flow path to maintain pressure or lock the actuator in position.
Reverse Opening (Return Flow): To allow return flow from the actuator side (A2) to the directional control valve side (A1), sufficient external control pressure must be applied to port X (the pilot port) of the Z2S10 valve; this actuates the pilot piston, which in turn pushes the valve poppet off its seat, opening the reverse flow path.
Valve body (1): Made of high-strength cast iron with internal oil passages, it serves as the base component for mounting all other parts.
Valve spool (1) and steel ball (2): These form the opening and closing mechanism of the main check valve. When fluid flows from A1 to A2, pressurized oil pushes the spool to one side, forcing the steel ball open and establishing a free-flow path. In the reverse direction, spring force presses the steel ball against the valve seat, ensuring a zero-leakage seal.
Pilot piston (4): This is the core component enabling "pilot-controlled" reverse opening. When reverse flow from A2 to A1 is required, pilot control oil from port X pushes this piston, mechanically forcing the main spool open to create a reverse flow path.
Pilot poppet (5) and check valve (3): Some models incorporate this auxiliary valve element in their internal structure. It opens first when the pilot piston actuates, serving a pre-opening function that effectively reduces hydraulic shock during the main spool's reverse opening, resulting in smoother operation.
| 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 |
Product Advantages
1. Zero-leakage pressure holding with high reliability
Utilizing a poppet-type hard-sealing structure, the valve achieves zero-leakage sealing in the reverse shut-off state. It ensures stable and reliable long-term pressure holding, effectively preventing actuators from slowly drifting or dropping due to internal leakage.
2. Stackable mounting saves space
The Z2S10 modular hydraulic check valve features an NG10 stackable design; it mounts directly between the directional control valve and the subplate, eliminating the need for additional piping connections.
3. Two-stage pilot structure for smooth reverse opening
When the pilot piston pushes the poppet, an auxiliary poppet (built into certain models) opens first to perform preliminary pressure relief before the main poppet opens; this effectively reduces hydraulic shock during reverse opening and ensures smoother operation.
4. Easy installation and excellent compatibility
The mounting interface complies with the ISO 4401 standard; mounting dimensions and ports are fully consistent with products of the same specifications from mainstream brands, allowing for direct interchangeability.
5. Mature Modular Platform Design
Based on a mature modular platform design and sharing the same technological lineage as the Z2S6 series, the NG10 size is suitable for medium-to-large systems. It offers reliable performance and has been proven through long-term market application.
Manufacturing Process
1. Precision Casting
The valve body is produced from high-strength cast iron or ductile iron through a precision casting process. During casting, the temperature of the molten alloy, filling speed, and solidification pressure are strictly controlled to ensure a dense internal structure-free of porosity and shrinkage defects-providing a high-quality blank for subsequent machining.
2. Blank Cleaning and Pre-treatment
Cast blanks undergo shot blasting, gate cutting, and surface cleaning to remove casting flash and surface contaminants. Dimensional checks and non-destructive testing are performed to eliminate defective castings before they enter the machining stage.
3. Precision Machining
Blanks are processed through multiple steps on high-precision machining centers:
Milling the mounting face
Drilling oil ports and threaded holes
Precision boring of valve bores and internal flow channels
Machining seal grooves
Key dimensions are held to ±0.005mm to ensure precise spool-to-bore clearance and reliable sealing at the mounting face. After machining, parts are deburred and surface-cleaned.
4. Heat Treatment (Critical Components)
Key components such as spools and pilot pistons undergo case hardening and quenching to achieve a surface hardness and improved wear resistance. Hardness testing and metallographic inspection are conducted post-treatment to ensure performance meets specifications.
5. Surface Treatment
Valve bodies are phosphated to enhance corrosion resistance and surface adhesion. Optional plating or coating is available for special environmental requirements.
6. Component Inspection
All machined parts undergo dimensional inspection, cleanliness testing, and visual inspection. Qualified parts are transferred to the assembly area. Critical components (spools and valve bodies) are paired for fit clearance verification.
7. Assembly
Seals and standard parts such as springs are selected per order specifications. Assembly of the valve body, spool, pilot piston, return spring, and other components is carried out in a clean environment. The sandwich design enables efficient, consistent assembly. Multiple in-process inspections are conducted throughout the assembly process.
8. Factory Performance Testing
Every unit must pass a comprehensive performance verification before shipping:
Pressure test: Verifies valve body strength and port sealing at maximum working pressure (315 bar)
Internal leakage test: Measures internal leakage at each port to ensure zero or within allowable limits
Cracking pressure test: Verifies cracking pressure meets the set value
Pilot function test: Verifies reliability and response time of pilot-operated reverse opening
Flow performance test: Verifies pressure drop and flow capacity at rated flow
Visual and cleanliness inspection: Checks surface finish quality and internal oil passage cleanliness
9. Packaging
After passing inspection, oil ports are sealed with dust plugs to prevent contamination during transport. Products are packed in standard cartons or wooden crates, accompanied by inspection reports and certificates of conformity.
10. Shipping
Products are shipped to global customers by sea, air, or courier. The company holds its own import/export license and handles customs clearance internally, with shipping methods selected by the customer.
1. Submit Requirements: Please inform us of your specific requirements (such as hydraulic valve model, number of sections, control method, operating conditions, etc.) via phone or email.
2. Receive Proposal: Our professional sales team will contact you within 24 hours to provide a tailored solution and a formal quotation.
3. Order & Production: Upon order confirmation, we will arrange production and conduct rigorous quality inspections prior to shipment.
4. Logistics & After-Sales: We arrange global shipping based on your needs and provide comprehensive technical support and after-sales service.
Phone Number
+8615076180506
info@wendefuvalve.com
FAQ
Q: What kind of valve is the Z2S10 modular hydraulic check valve, and where is it primarily used?
A: Z2S10 is a stackable hydraulic control check valve with NG10 diameter, used in hydraulic circuits to achieve leak-free pressure retention and load locking. In practical applications, its most common use is to prevent vertical cylinders from sliding down due to their own weight after shutdown, such as in press machine main cylinders, lifting cylinders, support cylinders, etc., where positions need to be maintained for a long time.
Q: Why won't it open in the reverse direction?
A: Check whether the pilot control pressure meets specifications and if the pilot oil circuit is blocked. The Z2S10 modular hydraulic check valve features a two-stage pilot design; if the pilot pressure is insufficient, the pilot piston cannot actuate the main poppet to open the valve.
Q: How should I address shocks or abnormal noises occurring during reverse opening?
A: This may be caused by the rapid opening of the poppet due to a sudden application of pilot pressure, air trapped in the system, or the absence of a pre-opening structure. Check if the pilot pressure is being applied too quickly and bleed air from the system; if frequent shocks occur, consider selecting a model equipped with a pre-opening structure.
Q: What causes the opening pressure of the Z2S10 valve to increase after prolonged use?
A: Possible causes include spring fatigue or deformation, deposits on the sealing surface of the poppet, or increased movement resistance of the pilot piston. It is necessary to disassemble the unit to inspect the poppet and pilot piston, clean off any deposits, and check the condition of the springs. In practice, this is often caused by a failure to change the oil in a timely manner.
Q: How should a stuck Z2S10 valve spool be handled?
A: Check the cleanliness of the hydraulic fluid, if contamination is confirmed, disassemble the unit to clean the spool and valve bore, and replace the fluid and filter element.
Hot Tags: z2s10 modular hydraulic check valve, China z2s10 modular hydraulic check valve, manufacturers, suppliers, factory, dc valve in hydraulic, directional flow control valve, directional spool valve, hydraulic dcv valve, pilot operated dc valve, tandem center directional control valve
