Shijiazhuang Laiye Import& Export Trading Co., Ltd. is one of the leading manufacturers and suppliers of pilot sequence valve in China, also supports customized service. If you're going to wholesale high quality pilot sequence valve made in China, welcome to get pricelist from our factory.
DZ10 Pilot Sequence Valve - 21 MPa, 150-450 L/min
The DZ10 is a pilot sequence valve. It controls the order actuators fire-clamp before press, mold close before inject. It watches pressure in one circuit and opens a path to another when the pressure hits a set point.
Take a press. The clamp cylinder has to grip the part before the main cylinder moves. The DZ10 watches the clamp pressure. When it reaches the set value, flow goes to the main cylinder. That's the sequence.
Three sizes: NG10 for 150 L/min. NG20 for 300 L/min. NG30 for 450 L/min. All rated at 21 MPa. Design number 30.
What problem does it solve?
Think about a press. The clamp cylinder has to grip the part before the main cylinder moves. If they move together, the part shifts. Scrap part, wasted time.
The DZ10 handles this. You set it to open at the pressure the clamp reaches when it's fully gripped. Below that point, the main cylinder gets nothing. Above it, flow goes through. Simple, mechanical, no electronics.
Same idea works for injection molding-mold closes before injection. Machine tools-clamp before cut. Assembly lines-position before fasten.
The check valve option
The DZ10 can be ordered with or without the check valve. With it, oil can flow backward from the secondary port to the inlet-no pilot pressure needed, no sequence required.
Why would you want that? Quick release. Take a clamping circuit. After the press finishes, the clamp needs to open. The check valve lets it open immediately. No waiting for the sequence valve to cycle. Faster turnaround, simpler plumbing.
Don't need reverse flow? Order it without the check valve. Fewer internal parts, lower cost.
Just tell us which one you want when you order.
Specification
| Parameter | NG10 | NG20 | NG30 |
|---|---|---|---|
| Max. Working Pressure | 21 MPa | 21 MPa | 21 MPa |
| Max. Flow | 150 L/min | 300 L/min | 450 L/min |
| Design Number | 30 | 30 | 30 |
| Pilot Options | Internal / External | Internal / External | Internal / External |
| Drain Options | Internal / External | Internal / External | Internal / External |
| Check Valve | Built-in (optional) | Built-in (optional) | Built-in (optional) |
Installation notes
Mounting
Mount on a subplate that matches standard porting patterns - DIN 24340 form A, ISO 4401.
Use the specified mounting bolts and torque to the correct value. Over-torquing can distort the valve body.
Port connections
Standard subplate ports: P (pressure), A (secondary), T (tank).
For external pilot: connect port X to the pilot pressure source.
For external drain: connect port Y directly to tank.
Pressure setting
Turn the adjustment element clockwise to increase the set pressure.
Use a pressure gauge on the primary circuit to verify the setting.
The set pressure is the pressure at which the valve opens to the secondary circuit.
Check valve function
The built-in check valve allows free flow from A to P.
This is not adjustable - it is a fixed cracking pressure.
Production Process
The manufacturing process for the Pilot Sequence Valve follows standard hydraulic component production, with additional attention to the pilot stage assembly and setting. Each step is documented and traceable.
Raw Material Inspection
High-strength cast iron and alloy steel are checked for composition and mechanical properties before anything else happens.
Precision Machining
CNC equipment handles milling, drilling, grinding, and honing to hold tight tolerances on bodies, spools, and end covers. After machining, all parts go through deburring, cleaning, and dimensional verification.
Heat Treatment
Key components such as spools and valve seats undergo hardening to improve wear resistance and extend service life. The pilot piston also receives specific treatment to ensure consistent operation.
Surface Treatment
Phosphating or other rust-proof coatings are applied to protect against corrosion and improve surface durability.
Sub-Assembly: Pilot Stage
The pilot stage is assembled separately. The spring is set to the nominal pressure range, and the pilot spool is fitted with its seals. The pilot stage is then tested for proper operation before final assembly.
Final Assembly
Skilled workers install the main spool, springs, seals, and the pre-assembled pilot stage in sequence, with torque control on each connection.
Pressure Testing
Every assembled valve goes through hydraulic testing-including sequence pressure setting verification, leakage detection, and functional debugging under rated working pressure. The sequence pressure is set and locked at the factory.
Final Inspection
Visual inspection, dimensional confirmation, and test data review. Each valve is individually tested, not spot-checked, with test data filed against its serial number for full traceability.
Packaging and transportation
Factory workshop
FAQ
Q: Manufacturer or trader?
A: Manufacturer. We run our own production.
Q: Can the DZ10 be used as a direct-acting sequence valve?
A: No. The DZ10 is pilot-operated. This means it uses system pressure to shift the main spool rather than direct solenoid or manual force. Pilot operation gives you more stable pressure control, especially in high-flow systems.
Q: What happens if the pilot supply pressure drops below the set point during operation?
A: The valve will close. The main spool returns to its normally closed position when pilot pressure drops below the spring setting. This is by design - the sequence will not continue until pressure is restored.
Q: Can the DZ10 be used in a circuit with variable flow?
A: Yes. The pilot-operated design compensates for flow variations better than direct-acting valves. The pressure setting remains stable across a wide flow range.
Q: How does external drain affect the installation?
A: External drain requires an additional line from port Y to tank. This adds one more connection but prevents backpressure at port A from affecting pilot performance. Use it when port A has significant backpressure.
Q: Can I mount the DZ10 in any orientation?
A: Yes. The valve can be mounted in any position. However, if you are using external drain, make sure the drain line returns directly to tank without restriction.
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