Rexroth relief valve DBE6X-1X/315G24-8NZ4M in stock.

Brand

REXROTH/German Rexroth

Application Areas

Chemical, Petroleum, Energy, Electrical, General

Rexroth proportional directional valve, Rexroth proportional directional valve, Rexroth Chinese agent

Rexroth directional valves are directional control valves with two or more flow patterns and two or more ports. They are used to achieve the communication, cut-off, and reversal of hydraulic oil flow, as well as pressure unloading and sequential action control. Rexroth relief valves can be categorized into manual directional valves, solenoid directional valves, and electro-hydraulic directional valves.

Functions of Rexroth relief valves:

Models LC..DB and LFA..DB

2-way cartridge valve with relief function

Sizes from 16 to 100

Standard installation according to DIN ISO 7368

Can achieve unloading, shut-off, and multiple pressure rating circuits

Cartridge options:

Seat valve piston

Seat valve-spool piston

Multiple control valves for manual and/or electronic proportional pressure regulation

Integrated in the control cover plate

Can be installed as a pilot control valve

Multiple combination options

Multiple opening pressures

Pressure rating range from 25 to 420 bar

Multiple methods for manual pressure adjustment

Multiple nozzle accessories

Seals optional

Main function of Rexroth relief valves:

Rexroth relief valve constant pressure relief function: In a fixed displacement pump throttling system, the fixed displacement pump provides a constant flow rate. When the system pressure increases, the flow rate demand decreases. At this time, the relief valve opens, allowing excess flow to return to the oil tank, ensuring a constant inlet pressure (i.e., pump outlet pressure) (the valve opening usually fluctuates with pressure).

Pressure stabilization: The relief valve is connected in series in the return oil line, generating back pressure and increasing the smoothness of moving parts.

System unloading: A small-flow solenoid valve is connected in series with the remote control port of the relief valve. When the solenoid is energized, the remote control port of the relief valve is connected to the oil tank, unloading the hydraulic pump. The relief valve then functions as an unloading valve.

Safety protection: The valve is closed during normal system operation. It only opens when the load exceeds the specified limit (system pressure exceeds the set pressure) for overload protection, preventing further pressure increases (typically, the set pressure of the relief valve is 10%–20% higher than the system's maximum operating pressure).

In practical applications, it is generally used as an unloading valve, a remote pressure regulating valve, a high/low pressure multi-stage control valve, a sequence valve, and to generate back pressure (connected in series in the return oil line).

There are generally two types of relief valves: 1. Direct-acting relief valve. 2. Pilot-operated relief valve. The main requirements for relief valves are: large pressure adjustment range, small pressure adjustment deviation, small pressure fluctuation, sensitive action, large overload capacity, and low noise. Daily maintenance precautions for Rexroth relief valves: Noise and vibration during operation. Pumps and valves are generally considered to be the components that easily generate noise in hydraulic devices, with relief valves and solenoid directional valves being the main types. Many factors contribute to noise generation. Relief valve noise can be categorized into flow velocity noise and mechanical noise. Flow velocity noise is mainly caused by oil vibration, cavitation, and hydraulic shock. Mechanical noise is mainly caused by the impact and friction of parts within the valve. (1) Noise caused by uneven pressure. The pilot valve section of a pilot-operated relief valve is a vibration-prone part, as shown in Figure 3. When overflowing under high pressure, the axial opening of the pilot valve is very small, only 0.003–0.006 cm. The small flow area and high flow velocity (up to 200 m/s) easily lead to uneven pressure distribution, causing radial force imbalance and vibration in the cone valve. Additionally, ellipticity during cone valve and seat machining, dirt buildup at the pilot valve port, and deformation of the pressure regulating spring can also cause cone valve vibration. Therefore, the pilot valve is generally considered the source of noise.

The presence of elastic elements (springs) and moving mass (cone valve) creates conditions for oscillation, and the pilot valve's front chamber acts as a resonant cavity. Therefore, vibration in the cone valve easily causes resonance throughout the valve, generating noise, which is usually accompanied by severe pressure fluctuations.

(2) Noise from Cavitation

When air is drawn into the oil for various reasons, or when the oil pressure is lower than atmospheric pressure, some of the air dissolved in the oil will precipitate and form bubbles. These bubbles are larger in low-pressure areas, but when they flow with the oil to high-pressure areas, they are compressed and their volume suddenly decreases or the bubbles disappear. Conversely, if the volume is smaller in high-pressure areas, it suddenly increases when flowing to low-pressure areas. This rapid change in the volume of bubbles in the oil generates noise, and because this process occurs instantaneously, it will cause local hydraulic shock and vibration. The pilot valve port and main valve port of a pilot-operated relief valve experience significant changes in oil flow rate and pressure, making cavitation easy and thus generating noise and vibration.

(3) Noise from Hydraulic Shock

When a pilot-operated relief valve is unloaded, pressure shock noise will occur due to the rapid drop in pressure in the hydraulic circuit. The higher the pressure and capacity of the working conditions, the greater the impact noise. This is because the unloading time of the relief valve is very short, resulting in hydraulic shock. During unloading, the oil flow rate changes drastically, causing a sudden pressure change and creating a pressure wave impact. The pressure wave is a small shock wave, and the noise it generates is very small. However, as it travels through the system with the oil, if it resonates with any mechanical part, it may increase vibration and enhance noise. Therefore, hydraulic shock noise is usually accompanied by system vibration.

(4) Mechanical Noise

The mechanical noise emitted by the pilot-operated relief valve generally comes from the impact of parts and the friction of parts caused by machining errors.

Sometimes, the noise emitted by the pilot-operated relief valve includes high-frequency mechanical vibration, generally called self-excited vibration. This is the sound caused by high-frequency vibration of the main valve and the pilot valve. Its occurrence rate is related to factors such as the configuration of the return oil pipeline, flow rate, pressure, and oil temperature (viscosity). Generally, the smaller the pipeline diameter, the lower the flow rate, the higher the pressure, and the lower the oil viscosity, the higher the occurrence rate of self-excited vibration. The following Rexroth relief valves are in stock:

4WE6D7X/HG24N9K4

4WE6D73-62/EG24N9K33L/A12

4WE6D50/AG24NZ5L

4WE6D6X/EG24N9K4/V (Plug 00057292 spare)

4WE6D6X/EG24N9K4

4WE6D-6X/OFCG24N9Z5L

4WE6D6X/EG24N9K4

4WE6D-6X/OFCG24N9Z5L

4WE6D60/220V

4WE6D6X/OFSG24N9K4

4WE6D6X/OFEG24N9K4

4WE6D62/EG24N9K4 4WE6D6X/OFEG24N9K4/B18 4WE6D51/AG24NZ4

4WE6B61/EG24N9K4 4WE6B62/EG24N9K4 4WE6D62/EG24N9K4 4WE6Y62/EG24N9K4

4WE6J62/EG24N9K4 4WE6E62/EG24N9K4 4WE6M62/EG24N9K4 4WE6H62/EG24N9K4

4WE6G62/EG24N9K4 4WE6L62/EG24N9K4 4WE10Y33/CG24N9K4 4WE10D33/CG24N9K4

4WE10C33/CG24N9K4 4WE10L33/CG24N9K4 4WE10U33/CG24N9K4 4WE10J33/CG24N9K4

4WE10E33/CG24N9K4 4WE10G33/CG24N9K4 4WE10H33/CG24N9K4 4WE6Y62/EW230N9K4

4WE6J62/EW230N9K4 4WE6G62/EW230N9K4 4WE6G62/EW110N9K4 4WE10D33/CW230N9K4

4WE10E33/CW230N9K4 4WE10J33/CW230N9K4 4WE10H33/CW230N9K4 4WE10G33/CW230N9K4

4WE6E62/EG24N9K4 4WE6E62/EW230N9K4 4WE6E6X/EG24N9K4 4WE6E50/AW220NZ5L

4WE6E6X/SG24N9K4 4WE6E62/EG12N9K4 4WE6E6X/SG24N9K4 4WE6E6X/EW230N9K4

4WE6E6X/EG24N9K4+Z5L 4WE6E6X/EG24N9K4/V 4WE6E6X/EG24N9K45058730

4WE6E6X/BG24N9K4_5031339 4WE6E61B/CW220-5N9Z5L 4WE6E6X/AG24N24

Our company mainly deals in European and American brands and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson Group)

American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, Vickers, Helón (Norgren)

Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi