Core Application Description
This guide focuses on Rexroth overflow valve series including DBD, DBW, Z2DB, DB, and ZDB, which are widely compatible with hydraulic systems of construction machinery (excavators, loaders), industrial machinery (injection molding machines, press machines), and automated production lines. Targeted at hydraulic system engineers, machinery maintenance technicians, and procurement managers of manufacturing/construction enterprises, it addresses core needs such as stabilizing hydraulic system pressure, preventing overpressure damage to components, and ensuring stable equipment operation. These high-precision overflow valves play a critical role in pressure regulation and overload protection, safeguarding the reliability and service life of hydraulic systems.
Product Classification & Technical Specifications
1. DBD Series Direct-Acting Overflow Valves
DBD series direct-acting overflow valves are designed for precise pressure control in small to medium-sized hydraulic systems, solving pain points such as system pressure fluctuations, component wear, and leakage caused by inaccurate pressure regulation. Suitable for hydraulic circuits of injection molding machines, small hydraulic presses, and automated production line actuators, they feature fast response, compact structure, and high pressure stability, ensuring consistent operation of hydraulic components.
No. | Product Model & Order Number | Material Description | Main Wear Causes | Damage Prevention Notes |
1 | Order Numbers: R900082639, R900331916, R900334105, R900334729, R900423713-R900423735, R900423743, R900423758, R900423780-R900423891, R900424082-R900424203, R900424241-R900424288, R900425164-R900425165, R900425660-R900425661, R900425966-R900426898, R900427242-R900427605, R900427940-R900438610, R900468547-R900478421, R900478766-R900496034, R900526571, R901073006; Models: DBDS10K1X/25P15, DBDH10K1X/630V, DBDA6K1X/315V, DBDH20K1X/25V, DBDS30P1X/100V-50, DBDS6G1X/100-50, DBDS6K1X/100-50, DBDS6P1X/100-50, DBDS8G1X/100-315, DBDS10G1X/25-50V, DBDS30G1X/100V-50, DBDA6K1X/25, DBDA10G1X/100, DBDA20K1X/100, DBDS10K1X/100-315V, DBDS20K1X/315V-50V, DBDH20G1X/50-25, DBDH20K1X/100-50V, DBDH10G1X/200-315, DBDH10K1X/100-630, DBDH6G1X/100-315V, DBDH6K1X/100-400V, DBDS20G1X/400-50V, DBDS25G1X/25-315, DBDH6P1X/100-400V, DBDS30K1X/50-315V, DBDS6K1X/200V-315V, DBDA10K1X/315-25V, DBDS10P1X/400-25V, DBDA6G1X/25-400, DBDS6P1X/25-315V, DBDH10P1X/100, DBDS15G1X/25, DBDA8G1X/50V | Valve body: High-strength alloy steel (42CrMo); Spool: Stainless steel (17-4PH) with precision grinding; Spring: Alloy spring steel (50CrVA) with heat treatment; Sealing ring: Nitrile rubber (NBR) or fluororubber (FKM) for high pressure resistance | 1. Spool wear and scratches caused by impurities in hydraulic oil, leading to pressure leakage; 2. Spring fatigue and deformation due to long-term high-frequency pressure cycling, resulting in reduced pressure regulation accuracy | 1. Use hydraulic oil that meets ISO 4406 Class 16/13 standards; install a high-precision filter (≥10μm) in the oil circuit and replace the filter element regularly; 2. Avoid long-term operation at the maximum rated pressure; control the system pressure within 80% of the valve's rated pressure, and check the spring elasticity annually |
2. DBW Series Solenoid-Operated Overflow Valves
DBW series solenoid-operated overflow valves are specialized for hydraulic systems requiring remote pressure control and automatic pressure switching, solving pain points such as low manual operation efficiency, slow pressure switching response, and difficulty in integrating with automated control systems. Suitable for hydraulic circuits of large construction machinery, automatic assembly lines, and multi-station hydraulic presses, they feature electromagnetic control, fast switching speed, and good compatibility with PLC control systems, improving the automation level of hydraulic systems.
No. | Product Model & Order Number | Material Description | Main Wear Causes | Damage Prevention Notes |
1 | Order Numbers: R900244659-R900249021, R900550746-R900978585, R901003898-R901046032; Models: DBW30A2-5X/100YU6EW110N9K4, DBW30B2-5X/350X6EG24N9K4, DBW20B2-5X/100U6EG24N9K4, DBW25BG2-5X/100U6EG24NK4, DBW15BG2-5X/315U6EW110N9K4V, DBW10B2-5X/200U6EW110N9K4, DBW20AG1-5X/350YU6EG24N9K4, DBW20A2-5X/100Y6EG24NK4, DBW20B2-5X/315YU6EW110N9K4V, DBW10A2-5X/200-6EW230N9K4, DBW30A1-5X/315-6EG24N9K4, DBW20A1-5X/315U6EG24N9K4, DBW20B1-5X/100U6EG24N9K4, DBW52BP2-3X/315XU6EW110N9K4, DBW20B3-5X/315U6EG24N9K4, DBW20B1-5X/315U6EW110N9K4, DBW20BG3-5X/200Y6EW110N9K4, DBW10A2-5X/315U6EG24N9K4, DBW10B3-5X/315S6EG24K4R12, DBW10A2-5X/100-6EW110N9K4V, DBW20A1-5X/315-6EW110N9K4, DBW10B2-5X/100-6EG24NK4, DBW52BF2-3X/315U6EW110N9K4, DBW15BG2-5X/315-6EW110N9K4, DBW20B3-5X/315YU6EW110N9K4V, DBW10A1-5X/350-6EG24N9K4, DBW52BP2-3X/315XYU6EW110N9K4, DBW20A2-5X/200U6EG24N9K4, DBW10B3-5X/315Y6EG24N9K4, DBW20B1-5X/100-6EW230N9K4, DBW20B2-5X/350-6EG24N9K4, DBW10BG2-5X/315-6EG24N9K4, DBW10B2-5X/315-6EG24N9K4, DBW30B2-5X/315-6EW110N9K4V, DBW20B2-5X/315-6EW230N9K4, DBW10B2-5X/200-6EW230N9K4, DBW20B2-5X/200-6EG24N9K4, DBW10B2-5X/200-6EG24N9K4, DBW30B2-5X/315-6EW110N9K4, DBW20A2-5X/350-6EG24N9K4, DBW20BG2-5X/315-6EG24N9K4, DBW20A2-5X/315-6EW230N9K4, DBW20B2-5X/315U6EG24N9K4, DBW10B2-5X/100U6EG24N9K4, DBW10B2-5X/315-6EG24N9K4V, DBW20B2-5X/200-6EG24N9K4V, DBW30B2-5X/315Y6EW110N9K4, DBW30A2-5X/315-6EW110N9K4, DBW30B1-5X/315-6EW110N9K4, DBW10B2-5X/100-6EW230N9K4, DBWTB2-5X/315-6EW110N9K4, DBW20B2-5X/315U6EW110N9K4, DBW10A2-5X/350-6EG24N9K4V, DBW30B2-5X/350-6EW110N9K4, DBW20B1-5X/315-6EG24N9K4, DBW20B2-5X/315Y6EG24N9K4, DBW20B2-5X/100-6EW230N9K4, DBW10B1-5X/315-6EG24N9K4, DBW20BG2-5X/100-6EW110N9K4, DBW20B2-5X/315-6EG24N9K4V, DBW10B2-5X/50-6EG24N9K4, DBW20A2-5X/315-6EG24N9K4, DBW20B2-5X/315-6EG48N9K4, DBW30A2-5X/315-6EG24N9K4, DBWTB2-5X/315-6EG24N9K4, DBW30B2-5X/315-6EG24N9K4, DBW20B2-5X/315XY6EG24N9K4, DBW20B1-5X/315-6EW110N9K4, DBW20B2-5X/100-6EW110N9K4V, DBW30B2-5X/200-6EG24N9K4, DBW15BG2-5X/315-6EG24N9K4, DBW20BG2-5X/100-6EG24N9K4, DBW10B2-5X/350-6EG24N9K4, DBW20B2-5X/315XYU6EG24N9K4, DBW20B2-5X/50-6EG24N9K4, DBW30B2-5X/315U6EW110N9K4, DBW10B3-5X/315U6EG24N9K4, DBW10B1-5X/200-6EW110N9K4, DBW10A2-5X/315-6EG24N9K4, DBW10A2-5X/200-6EG24N9K4, DBW30B2-5X/50-6EG24N9K4, DBW20B2-5X/315-6EW230N9K4V, DBW20B1-5X/315X6EW110N9K4, DBW30BG2-5X/100-6EG24N9K4, DBW20A2-5X/315-6EW110N9K4, DBW20B3-5X/315-6EG24N9K4, DBW30B2-5X/200-6EW110N9K4, DBW30A2-5X/200-6EG24N9K4, DBW52BP1-3X/315XU6EW110N9K4, DBW10B2-5X/200-6EG24N9K4V, DBW20BG2-5X/200-6EG24N9K4, DBW10B2-5X/315U6EG24N9K4, DBW10B2-5X/315XU6EG24N9K4, DBW20B2-5X/315YU6EG24N9K4, DBW30B2-5X/350Y6EG24N9K4, DBW10B1-5X/315-6EW110N9K4, DBW30BG2-5X/200-6EG24N9K4, DBW30A2-5X/315Y6EG24N9K4, DBW20B2-5X/200-6EG110N9K4, DBW30B2-5X/315U6EG24N9K4, DBW10B2-5X/200S6EG24NK4R10, DBW10A2-5X/200-6EG24N9K4, DBW20A3-5X/200-6EG24N9K4, DBW30A2-5X/315XU6EG24N9K4, DBW52BP2-3X/315U6EW110N9K4, DBW52BP1-3X/315U6EW110N9K4, DBW20A3-5X/315-6EG24N9K4, DBW10A2-5X/315-6EG24N9K4V, DBW10B3-5X/315-6EG24N9K4V, DBWTB2-5X/315-6EW110NK4V, DBW20B2-5X/315U6EG24K4, DBW10B1-5X/315Y6EG24N9K4, DBW10A1-5X/315-6EG24N9K4, DBW20A2-5X/315U6EG24N9K4, DBW20BG2-5X/200-6EW110N9K4, DBW30B2-5X/100U6EW110N9K4, DBW20AG2-5X/100-6EW110N9K4, DBW30B2-5X/350U6EG24N9K4, DBW30A2-5X/315U6EG24N9K4, DBW30B2-5X/315US6EG24NK4R12, DBW10A2-5X/350-6EG24N9K4, DBW20B2-5X/200U6EG24N9K4, DBW20A2-5X/315U6EW110N9K4, DBW20B2-5X/350U6EG24N9K4, DBW30B2-5X/100-6EG24N9K4V, DBW30B2-5X/315-6EG24NK4, DBW10B2-5X/100U6EW110N9K4, DBW30B2-5X/100-6EG110N9K4, DBW20A2-5X/200YU6EG24N9K4, DBW20BG2-5X/200-6EG24N9K4V, DBW52AP2-3X/315U6EW110N9K | Valve body: High-strength alloy steel (42CrMo); Spool: Stainless steel (17-4PH) with precision grinding; Solenoid core: Electrical pure iron (DT4E) with surface nickel plating; Spring: Alloy spring steel (50CrVA); Sealing ring: Fluororubber (FKM) for high temperature and pressure resistance; Solenoid coil: Copper wire with high-temperature resistant enameled wire | 1. Solenoid coil burnout caused by unstable control voltage or frequent on/off operations; 2. Spool jamming and wear due to moisture and impurities in hydraulic oil, affecting pressure switching performance | 1. Ensure the control voltage is stable within ±5% of the rated value; avoid frequent electromagnetic switching (control switching frequency ≤10 times/min); check the coil temperature regularly (normal temperature ≤60℃); 2. Maintain the hydraulic oil cleanliness to ISO 4406 Class 15/12; install a water separator in the oil tank to prevent moisture intrusion; drain water from the oil tank regularly |
3. Z2DB Series Pilot-Operated Overflow Valves
Z2DB series pilot-operated overflow valves are designed for large-flow hydraulic systems requiring high-precision pressure regulation, solving pain points such as large pressure loss, poor flow adaptability, and unstable pressure control in high-flow circuits. Suitable for hydraulic systems of large excavators, hydraulic presses, and heavy-duty forging machinery, they feature large flow capacity, low pressure loss, and high regulation precision, ensuring efficient and stable operation of large hydraulic equipment.
No. | Product Model & Order Number | Material Description | Main Wear Causes | Damage Prevention Notes |
1 | Order Numbers: R900335764, R900358222, R900408156, R900411312-R900411462, R900421937-R900441974, R900564533-R900565007, R900569169-R900599776, R900920715-R900967917, R978895588; Models: Z2DB22VD2-2X/315, Z2DB16VD2-2X/200, Z2DB10VD2-4X/315, Z2DB6VC2-4X/200V-50V, Z2DB6VD2-4X/200V-50V, Z2DB10VD2-4X/200V-315V, Z2DB10VC2-4X/315V-50V, Z2DB6VD2-4X/50V-200, Z2DB10VC2-4X/100-315, Z2DB6VC2-4X/315, Z2DB10VC2-4X/100V, Z2DB10VD2-4X/100, Z2DB10VC3-4X/200V, Z2DB6VC3-4X/315V-100V, Z2DB6VD3-4X/200V-315V, Z2DB10VD2-4X/200, Z2DBK10VC2-1X/210V, Z2DBK10VD2-1X/50V-210V, Z2DBK6VD2-1X/210V-50V, Z2DBK6VC2-1X/50V-210V, Z2DB6VD1-4X/200V, Z2DB22VD3-2X/100, Z2DB6VD2-4X/200-120V, Z2DB10VD7-4X/315V, Z2DB6VD3-4X/315V, Z2DB10VC1-4X/315V, Z2DB10VC7-4X/100V, Z2DB6VC1-4X/200, Z2DB10VD1-4X/100-315, Z2DB6VD1-4X/315V, Z2DB10VD3-4X/315 | Valve body: High-strength alloy steel (42CrMo) with quenching and tempering treatment; Main spool: Stainless steel (17-4PH) with precision grinding and honing; Pilot spool: Hardened alloy steel (GCr15); Spring: Alloy spring steel (50CrVA) with fatigue resistance treatment; Sealing ring: Fluororubber (FKM); Guide sleeve: Copper alloy (ZCuSn10Pb1) for wear resistance | 1. Wear of the main spool and guide sleeve due to long-term high-flow hydraulic oil scouring, leading to increased internal leakage; 2. Pilot valve blockage and pressure regulation failure caused by sludge accumulation in the pilot oil circuit | 1. Control the hydraulic oil flow within the valve's rated flow range; avoid long-term overload operation (flow ≤110% of rated flow); check the main spool for wear annually and replace if the wear amount exceeds 0.02mm; 2. Clean the pilot oil circuit and filter element every 6 months; use hydraulic oil with good anti-oxidation and anti-sludge properties, and replace the oil according to the equipment maintenance manual |
4. DB Series Relief Valves
DB series relief valves are versatile pressure control components for medium to large hydraulic systems, solving pain points such as system overpressure, component damage, and unstable operation caused by improper pressure relief. Suitable for hydraulic circuits of construction machinery (loaders, bulldozers), industrial hydraulic presses, and marine hydraulic systems, they feature strong overload capacity, reliable pressure relief performance, and good compatibility with various hydraulic oils, ensuring the safety of hydraulic systems under harsh working conditions.
No. | Product Model & Order Number | Material Description | Main Wear Causes | Damage Prevention Notes |
1 | Order Numbers: R900427217-R900463536, R900507746-R900594159, R900741286-R900991544, R900249511, R900590646-R900598998, R900700669-R900927959, R900338231-R900412317, R900419320-R900532966, R900583309-R900597307, R900591128-R900598995; Models: DB6K2-4X/315YJV-50YJV, DB6K7-4X/100Y-315Y, DB6K2-3X/100V, DB6K1-4X/350XY, DB6K2-4X/50P45YV-200P200Y, DB10-2-5X/350V-50V, DB10-3-5X/315-200, DB10-1-5X/315X-100, DB10G2-5X/200, DB10K2-4X/100XY-350XYV, DB10K7-4X/100XY, DB10K2-4X/315YJ, DB20K2-1X/315YV-50YV, DB20K3-1X/100Y-350Y, DB20K1-1X/200YV-350Y, DB20-2-4X/350-350X, DB20-2-5X/200XY-315V, DB20-1-5X/350-315U, DB20-3-5X/315U, DB20G2-5X/100-200, DB20K2-1X/315YJV-100XYJ, DB20K3-1X/350YV-100XYU, DB30-2-5X/315-100Y, DB30-1-5X/315, DB30G2-5X/315-50, DB30-3-5X/315-315X | Valve body: High-strength alloy steel (42CrMo); Spool: Stainless steel (17-4PH) with surface hardening treatment; Valve seat: Cemented carbide (WC-Co) for wear resistance; Spring: Alloy spring steel (50CrVA); Sealing ring: Nitrile rubber (NBR) or fluororubber (FKM) according to working temperature; Adjusting screw: Carbon steel (45#) with surface galvanizing | 1. Valve seat wear and leakage caused by high-pressure hydraulic oil impact and impurity scouring; 2. Adjusting screw loosening and pressure drift due to mechanical vibration of equipment during operation | 1. Install a pressure filter at the valve inlet to reduce impurity content in the oil; check the valve seat for wear every 8 months and grind or replace if necessary; 2. Use a lock nut to fix the adjusting screw after pressure setting; install anti-vibration pads at the valve mounting position; recheck and adjust the pressure regularly (every 3 months) to ensure it is within the set range |
5. ZDB Series Pressure Reducing Valves
ZDB series pressure reducing valves are specialized for hydraulic systems requiring multi-pressure level control, solving pain points such as unstable secondary pressure, large pressure fluctuation, and energy waste caused by improper pressure reduction. Suitable for hydraulic circuits of multi-station hydraulic presses, automated production lines, and construction machinery with multiple action requirements, they feature high secondary pressure stability, low pressure loss, and fast response, ensuring precise control of each actuator's working pressure.
No. | Product Model & Order Number | Material Description | Main Wear Causes | Damage Prevention Notes |
1 | Order Numbers: R900403470-R900432112, R900490094-R900598663, R900940177-R901335301; Models: ZDB6VA3-4X/200V-50V, ZDB6VP2-4X/200V-50V, ZDB6VB2-4X/200V-315V, ZDB6VA2-4X/50V-315V, ZDB6VP3-4X/200-50V, ZDB6VA3-4X/315V-100, ZDB6VA1-4X/200-315V, ZDB6VB3-4X/100-315V, ZDB6VP1-4X/50-315V, ZDB6VA7-4X/50V-315V, ZDB6VB7-4X/100V-50V, ZDB6VP7-4X/100V-350V, ZDB6VB1-4X/200V-50V, ZDB6VP2-4X/350V-160V, ZDB10VP1-4X/315V, ZDB10VP2-4X/200V-315V, ZDB10VB2-4X/100V-315V, ZDB10VA2-4X/315V-50V, ZDB10VA3-4X/50-200, ZDB10VP1-4X/200-200V, ZDB10VT2-4X/50-100V, ZDB10VP3-4X/315-200V, ZDB10VA1-4X/200-100V, ZDB10VT3-4X/50V, ZDB10VP7-4X/100V, ZDB10VA7-4X/200V-315V, ZDB10VB3-4X/100V, ZDB10VB1-4X/315V-50, ZDB10VT1-4X/50V-315, ZDB10VB7-4X/50-315V, ZDB10VP2-4X/80V-160V, ZDB10VP3-4X/80V-160V | Valve body: High-strength alloy steel (42CrMo); Spool: Stainless steel (17-4PH) with precision grinding; Pressure regulating spring: Alloy spring steel (50CrVA) with precision winding; Sealing ring: Fluororubber (FKM) for high pressure and temperature resistance; Throttle orifice: Cemented carbide (WC-Co) for wear resistance | 1. Throttle orifice wear and blockage caused by long-term high-velocity oil flow scouring and impurities, leading to reduced pressure regulation precision; 2. Spool wear and internal leakage due to thermal expansion and contraction in extreme temperature environments | 1. Maintain the hydraulic oil cleanliness to ISO 4406 Class 15/12; replace the oil filter element regularly; check the throttle orifice for wear and blockage every 6 months, and clean or replace if necessary; 2. Avoid installing the valve in environments with extreme temperature changes (working temperature range: -20℃ to 80℃); insulate the valve body if working in low-temperature environments; check the spool clearance regularly (standard clearance: 0.01-0.03mm) |
On-Site Fault Maintenance Case
Case: DBW Series Solenoid-Operated Overflow Valve Failure in an Injection Molding Machine
An injection molding factory reported that the hydraulic system of one of its injection molding machines frequently experienced pressure instability, leading to defective products. On-site inspection found that the DBW20B2-5X/315U6EG24N9K4 solenoid-operated overflow valve (order number: R900917569) had a burnt solenoid coil, and the spool was jammed by sludge. The root cause was that the control voltage fluctuated frequently (exceeding ±10% of the rated 24V) and the hydraulic oil had not been replaced for 2 years, resulting in sludge accumulation. The solution was to replace the solenoid coil, clean the spool and pilot oil circuit, replace the hydraulic oil and filter element, and install a voltage stabilizer in the control circuit. After maintenance, the hydraulic system pressure stabilized, and the defective product rate decreased by 95%. This case complies with ISO 4406:1999 (Hydraulic fluid power - Fluids - Determination of contamination levels) and DIN 24312 (Hydraulic valves - Mounting surfaces) standard requirements.
FAQ (Frequently Asked Questions)
Question | Answer |
How to correctly select Rexroth overflow valves (DBD, DBW, Z2DB, DB, ZDB) for different hydraulic system scenarios? | Key selection criteria: 1. According to system flow and pressure: For small-flow (≤50L/min) and medium-pressure (≤31.5MPa) systems (e.g., small injection molding machines), select DBD series direct-acting overflow valves; for large-flow (≥100L/min) and high-pressure (≤42MPa) systems (e.g., large hydraulic presses), select Z2DB series pilot-operated overflow valves. 2. According to control requirements: For systems requiring remote or automatic pressure switching (e.g., automated production lines), select DBW series solenoid-operated overflow valves; for systems requiring multi-pressure level control (e.g., multi-station hydraulic presses), select ZDB series pressure reducing valves. 3. According to working environment: For harsh environments with strong vibration and large temperature changes (e.g., construction machinery), select DB series relief valves with strong overload capacity and good environmental adaptability. 4. According to oil compatibility: Confirm that the valve's sealing material is compatible with the hydraulic oil used (e.g., use FKM seals for high-temperature synthetic oil). |
What are the key points for daily maintenance of Rexroth overflow valves to ensure their long-term stable operation? | 1. Oil quality management: Use hydraulic oil that meets the manufacturer's specifications; maintain oil cleanliness to ISO 4406 Class 15/12 or higher; replace the oil and filter element regularly (generally every 2000-4000 working hours); check oil moisture content and acid value regularly, and drain water or replace oil if exceeding the standard. 2. Pressure inspection: Check the valve's set pressure and pressure stability regularly (every 3 months); use a pressure gauge to verify that the actual pressure is consistent with the set value; adjust or calibrate if there is a deviation. 3. Component inspection: Inspect the valve body, spool, and spring for wear, deformation, and fatigue annually; replace worn or damaged components in time; check the solenoid coil's insulation resistance and temperature (insulation resistance ≥1MΩ, temperature ≤60℃). 4. Installation and environment: Ensure the valve is installed correctly (tightening torque meets specifications) and has good ventilation and heat dissipation; avoid mechanical collision and vibration; protect the valve from dust, moisture, and chemical corrosion. |
Procurement and Technical Reference Standards
Procurement Reference Standards
1. Authenticity & Certification: Purchase through Rexroth authorized distributors or certified suppliers to ensure genuine products, with complete certification documents including product certificate, ISO 9001 quality management system certification, and material test report. 2. Model Matching: Confirm the hydraulic system's parameters (flow, pressure, control method, oil type) and match the corresponding valve model; consult professional hydraulic engineers for model selection if necessary. 3. Quality Inspection: Upon receipt, check the product appearance (no scratches, deformation, corrosion), valve body marking (model, order number, manufacturer), and sealing performance (no oil leakage in pressure test); verify that the product parameters are consistent with the order. 4. Supplier Capability: Prioritize suppliers with professional technical support teams that can provide model selection guidance, on-site installation advice, and after-sales maintenance services; ensure the supplier has a complete after-sales service system.
Technical Problem Reference Standards
1. Fault Diagnosis Basis: Refer to Rexroth product technical manuals, ISO 4406:1999 (Hydraulic fluid power - Fluids - Determination of contamination levels), and DIN 24312 (Hydraulic valves - Mounting surfaces) for fault diagnosis; use professional instruments (pressure gauge, flow meter, insulation resistance tester) to measure parameters such as system pressure, flow, and coil insulation resistance. 2. Maintenance Operation Standards: Follow the product maintenance manual for disassembly, cleaning, and assembly; use special tools to avoid damaging precision components; ensure the hydraulic system is depressurized and oil-drained before maintenance. 3. Replacement Criteria: Replace the valve if it has the following conditions: severe internal leakage (leakage flow exceeding 5% of rated flow), pressure regulation failure (deviation exceeding ±10% of set pressure), severe wear of spool/valve seat, solenoid coil burnout, or irreparable deformation of the valve body. 4. Safety Standards: Comply with GB/T 3766-2015 (Hydraulic fluid power systems and components - General rules for safety) during maintenance; wear personal protective equipment (protective glasses, gloves, anti-oil boots); avoid hydraulic oil splashing and high-pressure oil injection.
Procurement Guidance
Rexroth overflow valves (DBD, DBW, Z2DB, DB, ZDB series) are core components ensuring the safety and stability of hydraulic systems. Whether you need to replace worn valves, upgrade hydraulic system pressure control performance, or maintain the normal operation of construction/industrial machinery, these high-quality, standard-compliant valves can provide reliable solutions. Please contact our professional sales team to learn more about product details, obtain personalized quotation information, and enjoy professional technical support services. Our team will wholeheartedly help you select the most suitable overflow valves based on your specific hydraulic system parameters and working conditions, supporting the efficient and safe operation of your equipment.
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