Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of modular relief valve in China, also supports customized service. If you're going to wholesale high quality modular relief valve made in China, welcome to get pricelist from our factory.
Custom properties
The ZDB6 modular relief valve is a compact, direct-operated pressure relief valve designed for use in modular hydraulic systems. It is widely applied in industrial hydraulic circuits where reliable pressure limitation, flexible installation, and space-saving design are required. The ZDB6 valve is typically mounted on a subplate or installed between directional control valves and manifolds, making it an integral part of modern modular hydraulic assemblies.
The primary function of the ZDB6 relief valve is to limit the maximum system pressure by diverting excess hydraulic fluid to the tank when the preset pressure level is exceeded. The valve operates on a direct-acting principle using a spring-loaded poppet or spool. Under normal operating conditions, the spring force keeps the valve closed. When system pressure rises above the adjusted setting, the hydraulic force overcomes the spring force, causing the valve to open and relieve pressure. Once the pressure drops to a safe level, the valve closes automatically.
One of the main advantages of the ZDB6 modular relief valve is its sandwich plate design, which allows it to be easily integrated into modular valve stacks without additional piping. This reduces installation time, minimizes leakage points, and improves system reliability. The valve is available in different pressure ranges and configurations, enabling it to be used as a main pressure relief valve, port relief valve, or pilot pressure limiter.
The ZDB6 valve offers fast response and dependable pressure protection, making it suitable for low to medium flow applications. Although direct-operated valves may exhibit some pressure override, the ZDB6 provides stable performance for most industrial requirements. Due to its compact structure, ease of maintenance, and flexible installation options, the ZDB6 modular relief valve is a practical and widely used solution in hydraulic systems requiring efficient pressure control and protection.
Transaction information
- Minimum order quantity: 10 pieces
- Payment method: T/T, Paypal, Western Union
- Supply Ability: Annual output of 1,000,000
- Delivery time: 10-15 days
- Conventional packing: Wooden case
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PRODUCT PARAMETERS |
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Specification |
6 |
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Max working pressure Mpa |
31.5 |
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Max.Flow (L/min) |
60 |
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Pressure adjustment Mpa |
5 / 10 / 20 / 31.5
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Design Number |
40 |
What makes it different
A standard relief valve mounts on its own subplate. Needs its own pressure lines, return lines, mounting bolts. Takes up space, requires planning.
The ZDB6 stacks right under the directional valve. Same bolts hold both. Oil flows through as part of the main circuit. No extra lines, no separate space.
That's the point of modular valves: you build a stack, not a network of pipes. Simpler, cleaner, fewer leak points.
How it works
The ZDB6 is direct-operated. A spring keeps the poppet closed. When system pressure builds enough to push past the spring, the poppet lifts and oil goes to tank. Pressure drops, spring pushes it shut again.
No pilot stage, no waiting. It opens when it needs to.
The adjustment changes spring force. Clockwise tightens it-higher pressure. Counterclockwise loosens it-lower.
About the company
Shijiazhuang Laiye Import & Export Trading Co., Ltd. belongs to Hebei Onederful® Hydraulic Technology Co., Ltd. We've been making hydraulic components since 1988 - directional valves, pressure valves, flow valves, and accessories. That's over 35 years of working with hydraulic systems, day in and day out.
We're a factory, not a trading company. Around 200 people, full in-house production: casting, machining, assembly, testing, phosphating. We control the process from raw material to finished valve.
Our products go to Russia, Europe, the Middle East, South America, and Asia. Different markets, different requirements - we've learned to adapt.
ISO 9001 certified. Every valve is tested individually, not spot-checked. Test data is filed against the serial number - we can trace it if there's ever an issue. Material certificates, test reports, and certificates of origin are available on request. OEM customization, technical support, and a 12-month warranty come standard.
Packaging and transportation
Factory workshop
FAQ
Q: What kind of valve is the ZDB6?
A: The ZDB6 is an NG6-sized sandwich-style pilot-operated relief valve designed to limit the maximum pressure in a hydraulic system, thereby providing safety protection and pressure stabilization. Featuring a sandwich design, it can be mounted directly between a directional control valve and the subplate, eliminating the need for external piping.
Q: What should be considered when installing the ZDB6?
A: The mounting surface must comply with the ISO 4401 standard, and the system must be fully depressurized prior to installation. Bolts must be tightened evenly in a diagonal pattern and in multiple stages according to the specified torque; tightening one side fully in a single step is prohibited, as this can cause valve body deformation, spool sticking, or increased internal leakage.
Q: How do I adjust the pressure?
A: Loosen the lock nut and rotate the adjustment bolt or knob clockwise to increase the pressure, or counter-clockwise to decrease it.
Q: What should be done if oil is seeping from the exterior of the valve body?
A: Check whether the mounting bolts are loose and tighten them in a crisscross pattern to the specified torque. If the bolts are secure, inspect the sealing ring for signs of aging or damage and replace the seal. An uneven mounting surface or the presence of debris can also cause leakage; therefore, the mounting surface should be cleaned and its condition inspected.
Q: How can you determine if the ZDB6 spring is fatigued?
A: Signs of spring fatigue include: a gradual decrease in the pressure setting, reduced pressure adjustment sensitivity, and increased pressure fluctuation.
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