DBK L40 Series Pilot Operated Relief Valves With Cartridge , Hydraulic Pressure Relief Valves

1. Specification

catridge system
high quality,competitive price
with good system design
matured machining technology

catridge system,The ensure system is apply in the big flow hydraulic pressure system.Cartridge valve system is build up by many wimble structure 2-ways cartridge valve, the leakquantity is nearly zero; the speed of movement can be controlled by damper on the top of cover board, so it can achieve the best performance between respond rate and hydraulic concussion; the cover board is multifunctional, it can design by the system needs, integration many function in the cover board can minish the cubage of hydraulic control block. Its easy to add or reduce the function in system. That is impossible for a board system.Our powerful research ability and multifunctional cartridge system is guarantee the advanced and reliability. Using the high quality and machining techniques made parts of ensure ensures the whole system work steadily. We customize various kinds of hydraulic system, give the best project to our client.

cause of issue
Noise and vibration
Hydraulics elements prone to noise is generally considered pumps and valves, relief valves and solenoid valve again based. Produce a lot of noise factors. Noise relief valve has a flow rate of two kinds of sound and mechanical sound. The flow rate of oil is mainly composed of sound vibrations, a hole, and hydraulic shock causes noise. Mechanical sound is mainly composed of valve parts and other impact and friction causes noise.
Noise (1) caused by uneven pressure
The pilot valve is part of a pilot-type relief valve Yi Zhen portion shown in Figure 3. When the overflow under high pressure, the pilot valve axial opening is very small, only 0.003 to 0.006 cm. Flow area is very small, high flow rate, up to 200 m / s, can lead to uneven distribution of pressure, so that the cone valve radial force imbalance and vibration. Also ovality generated when the poppet valve seat and cone processing, the pilot valve port and dirt stick to regulating spring deformation, vibration can cause the cone valve. It is generally believed that the pilot valve is noise occurring vibration source site.
Because of the elastic element (spring) and the moving mass (cone valve) presence constitutes a oscillation conditions, and the pilot valve chamber underway before a resonant cavity effect, so easy to cause vibration after the occurrence of the entire valve cone valve resonance and noisy, and more generally accompanied by intense pressure beating noise occurs.
Noise (2) holes generated
When a variety of reasons, air is sucked into the oil, or when the oil pressure below atmospheric pressure, part of the air dissolved in the oil will precipitate the formation of bubbles that larger area of ??low pressure at the time, when with oil when the flow to the high pressure zone, is compressed, the volume of the bubble disappearing suddenly or smaller; Conversely, if the volume of the high pressure zone could have been smaller, and when the flow area of ??low pressure suddenly increased volume, this volume of oil bubbles rapidly changing phenomenon. Sudden change in bubble volume will produce noise, and because this process occurs in an instant, will cause local hydraulic shock and vibration. Pilot relief pilot valve port and the main valve port, change the oil flow rate and pressure very, very prone to cavitation, resulting noise and vibration.
Noise (3) hydraulic shock generated
Pilot relief during unloading, due to a sharp drop in the pressure of the hydraulic circuit and the pressure impact noise occurs. The more large-capacity high-pressure working conditions, the greater the impact of noise, which is due to unloading relief valve for a short time to produce hydraulic shock caused at the time of unloading, due to the dramatic changes in oil flow rate, pressure caused by mutations cause pressure wave impact. Pressure wave is a small shock, noise itself is small, but with the spread of oil in the system, if a resonance with any mechanical parts, it is possible to increase the vibration and noise enhancement. Therefore, in the event of hydraulic shock noise, vibration and more generally associated with the system.
(4) mechanical noise
Mechanical noise pilot relief issued by the general strike and from parts due to manufacturing errors or the like generated by friction parts.
In the noise issued by the pilot relief valve, sometimes mechanical vibration frequency sound, generally called self-excited vibration sound. This is the voice of the main valve and pilot valve due to high frequency vibration occurs. Configure its incidence and the oil return pipe, flow, pressure, oil temperature (viscosity) and other factors. In general, the pipe diameter is small, low fl