Product Description
Product Overview
The DG-01 / DT-01 / DG-02 / DT-02 series are direct-acting pressure control valves manufactured by YUKEN Corporation (Japan), encompassing two functional categories: the DT-01/DG-01 Remote Control Relief Valve and the DT-02/DG-02 Direct Acting Relief Valve. The DT suffix denotes threaded (tube) connection, while the DG suffix indicates sub-plate (gasket) mounting — both share identical core performance parameters, differing only in mounting configuration to accommodate various manifold integration schemes.
The DT-01/DG-01 Remote Control Relief Valve is specifically designed for connection to the pilot control port of pilot-operated relief valves (such as the BG/BTG/S-BG series). By adjusting this valve’s setting pressure, the main system pressure can be remotely regulated. When combined with multiple solenoid valves switching between different remote control valves, it enables two-stage, three-stage, or even multi-stage pressure control — making it the core element for achieving sequential pressure switching in hydraulic circuits. The DT-02/DG-02 Direct Acting Relief Valve is used directly for maximum pressure limitation or safety protection in low-flow circuits, employing a direct-acting spring-poppet structure that operates independently without pilot pressure, serving dual functions as both relief valve and safety valve.
All models offer three selectable pressure adjustment ranges (B/C/H or Type 1/2/3) for optimized regulation accuracy and broader coverage. The valve body is manufactured from high-strength cast iron, with internal poppet and seat precision-lapped as matched pairs for reliable sealing and stable pressure regulation. Every unit undergoes 100% factory functional testing, guaranteeing drop-in interchangeability with original YUKEN systems — ready to install and operate out of the box.
Technical Specifications
DT-01-22 / DG-01-22 (Remote Control Relief Valve)
- Product Series: D Series — Remote Control Relief Valve
- Product Type: Direct-acting remote control relief valve for pilot-operated relief valve remote port connection
- Connection Type: DT = Threaded (tube) / DG = Sub-plate mounting (gasket)
- Port Size: 01 specification (1/8″ / Rc1/8)
- Maximum Working Pressure: 25 MPa (250 bar)
- Maximum Flow Rate: 2 L/min
- Pressure Adjustment Range (Type B): 1–7 MPa (10–70 kgf/cm²)
- Pressure Adjustment Range (Type C): 3.5–14 MPa (35–140 kgf/cm²)
- Pressure Adjustment Range (Type H): 7–25 MPa (70–250 kgf/cm²)
- Adjustment Method: Manual knob adjustment with locknut; clockwise to increase, counterclockwise to decrease
- Pressure Limiting Structure: Snap ring type — each ring corresponds to 10 MPa
- Design Number: 22
- Sub-plate Model (for DG-01): DGM-02-20, connection port Rc1/4
- Sub-plate Weight: Approx. 0.7 kg
- Accessories: DG-01 includes M5×45L hex socket head cap screws × 4
- Weight (DT type): Approx. 1.6 kg
- Weight (DG type): Approx. 1.4 kg
DT-02-※-22 / DG-02-※-22 (Direct Acting Relief Valve)
- Product Series: D Series — Direct Acting Relief Valve
- Product Type: Direct-acting relief valve / safety valve for low-flow circuit pressure limitation
- Connection Type: DT = Threaded (tube) / DG = Sub-plate mounting (gasket)
- Port Size: 02 specification (1/4″ / Rc1/4)
- Maximum Working Pressure: 21 MPa (210 bar)
- Maximum Flow Rate: 16 L/min
- Pressure Adjustment Range (Type B / 1): 0.5–7 MPa (5–70 kgf/cm²)
- Pressure Adjustment Range (Type C / 2): 3.5–14 MPa (35–140 kgf/cm²)
- Pressure Adjustment Range (Type H / 3): 7–21 MPa (70–210 kgf/cm²)
- Adjustment Method: Manual knob adjustment with locknut; clockwise to increase, counterclockwise to decrease
- Design Number: 22
- Weight (DT type): Approx. 1.5–1.6 kg
- Weight (DG type): Approx. 1.5 kg
DT-02-H-2290 (Direct Acting Relief Valve — High-Pressure Variant)
- Product Series: D Series — Direct Acting Relief Valve
- Connection Type: DT = Threaded (tube)
- Port Size: 02 specification (1/4″ / Rc1/4)
- Pressure Range Code: H = 7–21 MPa (70–210 kgf/cm²)
- Maximum Working Pressure: 21 MPa (210 bar)
- Maximum Flow Rate: 16 L/min
- Design Number: 2290 (Design 22 variant, 90 = special version identifier)
- Adjustment Method: Manual knob adjustment with locknut
- Weight: Approx. 1.5–1.6 kg
Model Code Decoding
- D: Series designation — Direct-acting relief valve / Remote control relief valve
- T / G: Connection type — T = Threaded (tube) / G = Sub-plate mounting (gasket)
- 01 / 02: Port size — 01 = 1/8″ (remote control type) / 02 = 1/4″ (direct acting type)
- B / C / H: Pressure adjustment range — B = Low range / C = Mid range / H = High range
- 22 / 2290: Design number — 22 = Standard design / 2290 = Special design variant
- F- (prefix): Special seal — designated for phosphate ester working fluid
Key Technical Advantages
1. Direct-Acting Design · Ultra-Fast Pressure Response
The DT/DG series employs a classic direct-acting spring-poppet structure where the spring force acts directly on the poppet for pressure control, requiring no pilot pressure assistance. This means the valve opens to relieve flow the instant system pressure exceeds the set point, with minimal response delay — ideal for applications requiring rapid overpressure protection. Compared to pilot-operated relief valves, the direct-acting design delivers superior dynamic response characteristics and more stable pressure control accuracy in small-to-medium flow applications.
The DT/DG series employs a classic direct-acting spring-poppet structure where the spring force acts directly on the poppet for pressure control, requiring no pilot pressure assistance. This means the valve opens to relieve flow the instant system pressure exceeds the set point, with minimal response delay — ideal for applications requiring rapid overpressure protection. Compared to pilot-operated relief valves, the direct-acting design delivers superior dynamic response characteristics and more stable pressure control accuracy in small-to-medium flow applications.
2. Three-Stage Pressure Ranges · Precision Regulation
The full series offers three selectable pressure adjustment ranges (B = low, C = mid, H = high), each with a moderate span that optimizes the match between spring rate and poppet stroke, delivering higher regulation resolution. The snap-ring pressure limiting design ensures clearly defined adjustment steps — each ring corresponds to a fixed pressure increment (10 MPa) — providing smooth, chatter-free adjustment without pressure pulsation, effectively avoiding the accuracy degradation common in single-range wide-span designs.
The full series offers three selectable pressure adjustment ranges (B = low, C = mid, H = high), each with a moderate span that optimizes the match between spring rate and poppet stroke, delivering higher regulation resolution. The snap-ring pressure limiting design ensures clearly defined adjustment steps — each ring corresponds to a fixed pressure increment (10 MPa) — providing smooth, chatter-free adjustment without pressure pulsation, effectively avoiding the accuracy degradation common in single-range wide-span designs.
3. Dual Mounting Options · Flexible Integration
Every model is available in both DT (threaded/tube) and DG (sub-plate/gasket) mounting configurations with identical core performance parameters. The DT type screws directly into piping or manifold blocks without requiring a sub-plate, saving installation space — ideal for integrated manifold blocks and compact hydraulic power units. The DG type uses a standardized sub-plate mounting face compatible with DGM-series sub-plates, facilitating centralized piping and simplified maintenance replacement. Both options can be selected based on system integration requirements without modifying the circuit design.
Every model is available in both DT (threaded/tube) and DG (sub-plate/gasket) mounting configurations with identical core performance parameters. The DT type screws directly into piping or manifold blocks without requiring a sub-plate, saving installation space — ideal for integrated manifold blocks and compact hydraulic power units. The DG type uses a standardized sub-plate mounting face compatible with DGM-series sub-plates, facilitating centralized piping and simplified maintenance replacement. Both options can be selected based on system integration requirements without modifying the circuit design.
4. Remote Multi-Stage Pressure Control Capability
The DT-01/DG-01 remote control relief valve connects directly to the remote port of pilot-operated relief valves (such as BG/BTG/S-BG series), enabling remote system pressure adjustment simply by changing this valve’s setting. Combined with two or three solenoid valves switching between different remote control valves, it achieves two-stage, three-stage, or multi-stage pressure control to meet varying pressure demands across different machine operating modes (rapid traverse → feed → holding), providing exceptional circuit design flexibility.
The DT-01/DG-01 remote control relief valve connects directly to the remote port of pilot-operated relief valves (such as BG/BTG/S-BG series), enabling remote system pressure adjustment simply by changing this valve’s setting. Combined with two or three solenoid valves switching between different remote control valves, it achieves two-stage, three-stage, or multi-stage pressure control to meet varying pressure demands across different machine operating modes (rapid traverse → feed → holding), providing exceptional circuit design flexibility.
5. Precision Lapped Mating Surfaces · Low-Leakage Sealing
Internal poppet and seat components are precision-lapped as matched pairs, ensuring extremely high sealing surface conformity and minimal leakage in the closed state. The valve body is manufactured from high-strength cast iron, stress-relieved for dimensional stability. All sealing surfaces maintain strict surface roughness specifications, guaranteeing stable sealing performance and regulation accuracy even after extended service life.
Internal poppet and seat components are precision-lapped as matched pairs, ensuring extremely high sealing surface conformity and minimal leakage in the closed state. The valve body is manufactured from high-strength cast iron, stress-relieved for dimensional stability. All sealing surfaces maintain strict surface roughness specifications, guaranteeing stable sealing performance and regulation accuracy even after extended service life.
6. Full Interchangeability · Drop-In Replacement
The DG/DT-01 and DG/DT-02 series are fully compatible with original YUKEN products — mounting dimensions, port specifications, and sub-plate interfaces all strictly follow YUKEN standard designs. Every unit undergoes 100% factory functional testing (including pressure setting accuracy, sealing integrity, and response verification), ensuring direct replacement of existing valves on-site without piping or manifold modifications — true drop-in interchangeability.
The DG/DT-01 and DG/DT-02 series are fully compatible with original YUKEN products — mounting dimensions, port specifications, and sub-plate interfaces all strictly follow YUKEN standard designs. Every unit undergoes 100% factory functional testing (including pressure setting accuracy, sealing integrity, and response verification), ensuring direct replacement of existing valves on-site without piping or manifold modifications — true drop-in interchangeability.
Application Areas
- Hydraulic Power Unit Safety Protection: DT-02/DG-02 installed as safety valves at定量泵 (fixed-displacement pump) outlets to limit maximum system pressure, preventing overpressure damage from sudden load changes or actuator stall conditions
- Multi-Stage Pressure Switching Circuits: DT-01/DG-01 paired with solenoid valve banks connected to pilot relief valve remote ports, enabling automatic pressure switching in machine tool hydraulic systems (rapid traverse → feed → holding)
- Injection Molding Machine Clamping Systems: Pressure switching control for mold closing (low pressure, high flow) and mold locking/holding (high pressure, low flow) sequences
- Compact Hydraulic Power Units: DT-02/DG-02 as primary pressure regulation or safety valves in low-flow circuits for machine tool auxiliary circuits, fixture circuits, and lubrication systems
- Mobile Equipment Pilot Control Circuits: Pressure limitation and protection for pilot oil circuits, ensuring stable control pressure for pilot-operated directional valves
- Test Benches & Diagnostic Equipment: Utilizing three adjustable pressure ranges for system pressure calibration and overpressure protection settings
- Die Casting & Forging Equipment: Safety valve function to limit hydraulic system peak pressure, protecting dies and hydraulic components
- Rubber & Plastics Machinery: Pressure control and safety protection for hydraulic systems in vulcanizing presses, extruders, and blow molding machines
Expert Maintenance Tips
- Pressure Adjustment Procedure: Always loosen the locknut before adjustment. Rotate the handle clockwise slowly to increase pressure, counterclockwise to decrease. After setting, immediately tighten the locknut to prevent setting drift from vibration during operation. Never make rapid, large-stroke adjustments while the system is pressurized.
- Remote Control Line Volume Control: When DT-01/DG-01 is used for remote control, excessive internal volume in the pilot line causes vibration and oscillation during pressure switching. Use tubing with an internal diameter no greater than 4 mm, and keep line length as short as possible (recommended ≤ 8 meters) to ensure real-time pressure transmission and stability.
- Independent Tank Return Line: The drain port (T port) of both DT-01/DG-01 and DT-02/DG-02 must be piped directly and independently back to the reservoir — never combine with other valve return lines. Return line backpressure directly affects regulation accuracy and valve actuation characteristics; excessive backpressure will cause the actual opening pressure to exceed the set value.
- Snap Ring Adjustment Method: When the working pressure cannot reach the required value, adjust the pressure limit by adding or removing snap rings. Each ring corresponds to approximately 10 MPa of pressure change. Always depressurize and confirm the system is in a safe state before removing snap rings.
- Seal Inspection & Replacement: DG-type sub-plate mounted valves use O-ring seals on the mounting face (DG-01: 12×1.9 mm; DG-02: 12×1.9 mm and 22.4×2.65 mm). Inspect O-rings for aging, deformation, or damage at every disassembly — replace immediately if compromised. The mounting face must be kept clean, with surface finish no worse than 6-S grade.
- Special Media Seal Selection: Standard seals are compatible with mineral-based hydraulic oils. If the system uses phosphate ester-based synthetic fluids, the F-prefix special seal model (e.g., F-DT-02-H-22) must be selected — never use standard seals, as they will rapidly swell and fail.
Company Profile
Frequently Asked Questions
1.What ls our Main Products?
1.Hydraulic pump
2.Hydraulic valve
3.Hydraulic motor
4.Hydraulic cylinder
5.Hydraulic parts
2. What about the MOQ?
3.What are your advantages?
- Adhere to quality first.
- Support customization, ODM & OEM service.
- 1-year warranty and complete after-sales support.
- Safe and fast shipping worldwide.
- 24-hour online service for your inquiries.
4.Are you a manufacturer? What’s your delivery time?
Yes, we are a manufacturer with our own factory.
Common models are in stock, and orders are usually shipped within 1–3 days.
5.Which payment methods are accepted?
We accept T/T, L/C, PayPal, VISA, Western Union, Apple Pay, Google Pay, Afterpay (Clearpay), Klarna, and Trade Assurance.
For full orders: 30% deposit, balance before shipment.
For small/sample orders: full payment in advance.
6.How will you deliver my goods?
We offer flexible shipping options: DHL, UPS, FedEx, TNT, EMS, as well as air or sea freight.
All deliveries ensure door-to-door fast and safe service.
7.How do you inspect and guarantee your products?
All products are tested before shipment to ensure perfect working condition.
We offer a 12-month warranty — if a product fails due to quality issues, we provide free spare parts or repair support.
8.What about after-sales service?
If you encounter any problem during use, please contact your sales manager or our support team at any time.
We will respond quickly and help solve the issue efficiently.
9.What are your main applications?
- Hydraulic systems
- Agricultural machinery
- Construction machinery
- Automobile industry
- Local distributors and maintenance centers
10.Can I get a discount for bulk orders?
Yes. We offer competitive wholesale prices and try our best to give benefits to long-term partners.
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