Italian ATOS relief valve AGAM-10/11/350-IX 24DC in stock.

Brand

ATOS/Italian Atos

ATOS Piston Pumps, ATOS Gear Pumps, ATOS Axial Piston Pumps, ATOS Vane Pumps, ATOS Hydraulic Cylinders, ATOS Relief Valves

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ATOS pilot-operated relief valves come in various structures. Figure 6.9 shows a typical three-section concentric pilot-operated relief valve, which consists of a pilot valve and a main valve. The valve's operating principle is shown in Figure 6.10.

The Italian ATOS pilot-operated relief valve, as shown in the diagram, consists of a cone-shaped pilot valve 1, a damping orifice (fixed throttling orifice) 5 on the main valve core, and a pressure regulating spring 9. Together, they form a pilot-stage half-bridge pressure-dividing negative feedback control system, responsible for providing the main-stage command pressure P2, after being regulated by the pilot valve, to the upper chamber of the main valve core 6. The main valve core acts as a comparator in the main control circuit. Its upper end face receives the command force P2A2, while its lower end face serves as the pressure measuring surface of the main circuit, receiving a feedback force P1A1. The combined force drives the valve core, adjusting the size of the relief port, ultimately achieving the purpose of regulating and stabilizing the inlet pressure P1.

Italian ATOS pilot-operated relief valve, Figure 6.9 YF type three-section concentric pilot-operated relief valve structure diagram (pipe type): 1-Pilot Valve (pilot valve); 2-Poppet Seat; 3-Valve Cap; 4-Valve Body; 5-Orifice; 6-Main Spool; 7-Main Valve Seat; 8-Main Spring; 9-Adjustment Spring (pilot valve) Spring; 10-Adjusting Screw; 11-Adjusting Handwheel.

Italian ATOS pilot-operated relief valve

In hydraulic systems, pumps and valves are generally considered to be the components that easily generate noise, with relief valves and solenoid directional valves being the main types. Many factors contribute to noise generation. Relief valve noise includes two types: 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. During high-pressure relief, the axial opening of the pilot valve is very small, only 0.003~0.006 cm. The flow area is small, and the flow velocity is very high, reaching 200 m/s, easily causing uneven pressure distribution, resulting in an imbalance of radial force in the cone valve and vibration. Additionally, the ellipticity generated during the machining of the cone valve and cone valve seat, dirt adhering to 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 front cavity of the pilot valve acts as a resonant cavity. Therefore, vibration of the cone valve easily causes resonance throughout the valve, generating noise. This noise 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 operating 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 can increase vibration and amplify 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 produced by the 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. ATOS Pilot-Operated Relief Valves (Italy)

ATOS Pilot-Operated Relief Valves (Italy)

AGAM-10/10/210

AGAM-10/10/210/V-IX 24DC

AGAM-10/10/210-IX 230/50/60AC

AGAM-10/10/210-IX 24DC

AGAM-10/10/210-IX 24DC 34/WG

AGAM-10/10/350 34

AGAM-10/10/350/V-IX 24DC

AGAM-10/10/350-1X 24DC 34

AGAM-10/100

AGAM-10/100

AGAM-10/100/V

AGAM-10/11/100 34

AGAM-10/11/100/7PA-M-AO 24DC

AGAM-10/11/100-IX 230/50/60AC

AGAM-10/11/210-IX 230/50/60AC

AGAM-10/11/210-IX 24DC

AGAM-10/11/350/PA-GK-AO 24DC 22

AGAM-10/11/350-IX 110/50/60AC

AGAM-10/11/350-IX 24DC

AGAM-10/20/210/100-IX 24DC

AGAM-10/20/350/100-IX 230/50/60AC 34 AGAM-10/20/350/210/V-IX 230/50/60AC 34

AGAM-10/20/350/210-IX 230/50/60AC 34

AGAM-10/20/350/210-IX 24DC 34

AGAM-10/21/350/100-IX 24DC 34

AGAM-10/21/350/210-IX 230/50/60AC 34

AGAM-10/22/100/100-IX 24DC 34

AGAM-20/10/100/V-IX 24DC 53

AGAM-20/10/210/V-IX 24DC 53 AGAM-20/10/210-IX 230/50/60AC

AGAM-20/10/210-IX 24DC

AGAM-20/10/350-IX 230/50/60AC

AGAM-20/10/350-IX 24DC

AGAM-20/11/210/M-AO 220 21

AGAM-20/11/210/V-IX 24DC 53

AGAM-20/11/210-IX 230/50/60AC

AGAM-20/11/210-IX 24DC

AGAM-20/11/350-IX 24DC 53

AGAM-20/210/V 53 /WG AGAM-20/22/350/350-IX 24DC

AGAM-20/350

AGAM-32/10/210-IX 24DC

AGAM-32/10/350-IX 24DC Our company primarily deals with European and American brands, and can source brands from any European country. For example, our key German brands include: FESTO, BURKERT, BOSCH-REXROTH, IFM, TURCK, P+F, BALLUFF, SICK, HIRSCHMAN, MURR, HYDAC, GSR, CROUZET, E+H, PILZ, HAWE, SIEMENS, STAUFF, EUCHNER, EMG, UNIVER, ATOS, NORGREN, and approximately 500 other European brands of varying sizes. We have cooperative relationships with approximately 500 other European brands.

We also have companies in the US, and we cooperate with approximately 200 brands, including ASCO, Vickers, MAC, Parker, MOOG, Fairchild, Denison, Ross, UE, MTS, and GEFRAN.

We have distribution rights for Japanese brands, such as CKD, TOYOOKI, NACHI, DAIKIN, SMC, KOGANEI, TACO, NOK, and TOKIMEC.