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G1DB/DBW Explosion- Proof Pilot Relief Valve - NG10 to NG30, 35 MPa
In a standard factory, a regular relief valve does the job. In a petrochemical plant or a mine, it's a different story. A spark inside the valve could ignite the atmosphere around it. That's why the G1DB/DBW exists.
It does what any relief valve does-it limits pressure. But it does it inside a flameproof enclosure. If something ignites internally, the enclosure keeps it contained. The flame doesn't get out.
The G1DB/DBW is pilot-operated. Comes in NG10 to NG30 sizes, flows from 250 to 650 L/min at 35 MPa. Pressure settings: 5, 10, 20, 31.5, or 35 MPa.
The "G1" prefix means explosion-proof. The "W" means it has a solenoid for remote unloading.
Explosion-proof vs standard
A standard relief valve is a potential ignition source. The electrical terminals, the coil, the contacts-any of them can spark. In a hazardous area, that spark is a real problem.
The G1DB/DBW uses a flameproof enclosure. The housing is built to contain any internal ignition. The flame path is machined to precise clearances to cool escaping gases. This isn't a coating or a seal-it's a structural design that's tested and certified.
So performance isn't the difference. Both valves limit pressure. The difference is safety. In a hazardous area, you don't have a choice-you need the explosion-proof version.
Six ways to think about this valve
1. What flow and pressure can it handle?
NG10: 250 L/min. NG20: 500 L/min. NG30: 650 L/min. All rated at 35 MPa. Pressure settings: 5, 10, 20, 31.5, or 35 MPa.
2. What's the difference between G1DB and G1DBW?
G1DB is pressure relief only. G1DBW adds solenoid unloading - you can drop system pressure on command.
3. What voltage options are available?
DC 12V, DC 24V, AC 110V, and AC 220V. Pick whichever matches your control system.
4. How do I install it?
Same as a standard DBW valve - subplate mounting. The explosion-proof housing adds bulk, so check the dimensional drawing before you plan the installation.
5. What about maintenance?
Same as standard valves, with one extra check: the flame path gaps. If you open the enclosure for service, check the gaps before reassembly. If the gaps exceed spec, the enclosure no longer meets its certification.
6. What certifications does it carry?
That depends on the specific coil and configuration. ATEX, IECEx, and CNEx are available. Specify your required standard and zone classification when ordering.
Product details
Explosion-proof housing
Pressure rating: 1.8 MPa minimum. Joint surface gap: under 0.2 mm. That's what keeps an internal flame from escaping.
Intrinsically safe circuit (DBW type)
Control current limited to under 150 mA. Not enough to spark an ignition.
Pilot stage pressure control
Set pressure range: 2 to 31.5 MPa. Adjustment ratio: 20:1. Gives you fine control over the set point.
Main valve stage
At 600 L/min, pressure fluctuation stays under 5%. Stable, even at high flow.
Safety redundancy
Instantaneous overpressure response: under 15 ms. Fast enough to catch pressure spikes before they become a problem.
Unloading function (DBW type)
Dual electromagnet control. Supports normally open or normally closed mode. Pressure drop during unloading: under 0.5 MPa. Energy saving: up to 40%.
Seals
Fluororubber + PTFE composite. Resists hydraulic oil, seawater, and acidic media.
Coating
External epoxy coating. Salt spray test: over 1000 hours. That's corrosion resistance you can rely on.
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PRODUCT PARAMETERS |
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Specification |
10 / 15 / 20 / 25 / 30 |
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Max working pressure Mpa |
35 |
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Max.Flow (L/min) |
250 / 500 / 600 |
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Working voltage |
DC |
12/24 |
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AC |
110/220 |
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Pressure adjustment Mpa |
5 / 10 / 20 /31.5 / 35 |
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Design Number |
50 |
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Product description
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Onederful® Hydraulic |
DB/DBW . … 50C type pilot-operated relief valve/solenoid relief valve belongs to pressure valves |
pressure valve |
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| Nominal diameter 10 to 32 | Pressure up to 35 MPa | Flow rate up to 650L/min | |||
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The DB…50C series Explosion- Proof Pilot Relief Valve are available in three sizes (plate type): 10, 20, and 30; and five sizes (pipe type): 10, 15, 20, 25, and 30. They are available in five pressure settings: 5.0 MPa, 10 MPa, 20 MPa, 31.5 MPa, and 35 MPa. Flow rates are 250 L/min (size 10), 500 L/min (sizes 15, 20, and 25), and 650 L/min (size 30). Connection methods include plate type, pipe type, and cartridge type.
Compared to the DB.3XC series pilot-operated relief valve, which our company has introduced and is already mass-producing, the DB.50C series features higher working pressure and stronger flow capacity. This valve can be widely used in hydraulic systems for lifting and transport equipment, construction machinery, engineering vehicles, machine tools, ships, metallurgical equipment, and other applications. |
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Model |
D1 |
ΦD2 |
T1 |
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DB(DBW)10G |
G1/2*(M22X1.5) |
34 |
14 |
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DB(DBW)15G |
G3/4*(M27×2) |
42 |
16 |
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DB(DBW)20G |
G1*(M33X2) |
47 |
18 |
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DB(DBW)25G |
G1 1/4*(M42×2) |
58 |
20 |
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DB(DBW)30G |
G1 1/2*(M48×2) |
65 |
22 |
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Technical parameters |
Dimension unit (mm) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Generally
Hydraulics
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Manufacturing process
Installation notes
Mounting: Same subplate pattern as standard DBW valves. Bolt it down, connect the ports.
Flame path: The explosion-proof certification depends on the gap clearances between the enclosure and the mating surfaces. Do not modify these surfaces. Do not use the valve if the gaps are damaged.
Electrical connection: Use a certified flameproof cable gland. The gland is part of the certification - not just a seal. If you use the wrong gland, the valve is no longer explosion-proof.
Maintenance: If you open the enclosure for service, check the flame path gaps before reassembly. If they exceed specification, the valve must be returned to the factory for repair or recertification.
Coil replacement: Use only certified replacement coils. A standard coil from a non-explosion-proof valve will not maintain the certification.
Where it belongs
The G1DB/DBW goes wherever standard valves cannot be used due to explosion risk:
Petrochemical plants - flammable gas and vapor atmospheres
Mining equipment - methane and coal dust hazards
Offshore platforms - oil and gas environments
Hazardous area hydraulic systems - anywhere with Zone 1, Zone 2, Zone 21, or Zone 22 classification
Packaging and transportation
Factory
Company exhibition
FAQ
Q: What is an explosion-proof pilot-operated relief valve, and what is its primary function?
A: An explosion-proof pilot relief valve is a pilot relief valve with a flameproof solenoid coil. It provides pressure control and unloading in hydraulic systems for flammable or explosive environments.
Q: What causes the system pressure to fail to build up?
A: Main causes: stuck or worn main spool (increased internal leakage), weak or broken pilot spring, or clogged damping orifice in the main spool.
Q: How can the issue of continuously rising system pressure and a relief valve failing to unload be resolved?
A: Pressure won't drop and valve won't unload? Usually the solenoid is dead or the main spool is stuck closed.
Q: How should unstable or highly fluctuating pressure be addressed?
A: Remedies: bleed air, check return line, clean pilot body and damping orifice. If a vibration-damper is fitted, check it first.
Q: What causes external oil seepage or increased internal leakage in the valve body?
A: External seepage: worn or damaged seal at the mounting face. Internal leakage: enlarged spool-to-sleeve clearance from long-term wear.
Q: How should a burnt-out explosion-proof solenoid coil or a wiring fault be handled?
A: Replace burnt coil with same-type flameproof coil. Check terminal and ground connections inside the box. Burnout is often from voltage instability, moisture, or high oil temperature.
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