AVENTICS pneumatic safety valve R414000728 is in stock.

Brand

AVENTICS/Germany

Application Areas

Chemical, Petroleum, Mining, Road/Rail/Marine, Comprehensive

AVENTICS Pneumatic Safety Valve Operation Method

Adjustment of Discharge and Reseating Pressure:

① To adjust the valve's discharge and reseating pressures, a test operation at the valve's full opening height must be performed. Therefore, this can only be done on a large-capacity test device or after the safety valve is installed on the protected equipment. The adjustment method varies depending on the valve structure.

② For structures with a backwash plate and a valve seat adjusting ring, adjustment is performed using the valve seat adjusting ring. Unscrew the adjusting ring fixing screw, insert a thin iron rod or similar tool through the exposed screw hole, and you can rotate the teeth on the adjusting ring to make it rotate left and right. When the adjusting ring is rotated counterclockwise to the left, its position rises, and both the discharge and reseating pressures decrease. Conversely, when the adjusting ring is rotated clockwise to the right, its position falls, and both the discharge and reseating pressures increase. During each adjustment, the adjusting ring should not be rotated too much (generally, a few turns are sufficient). After each adjustment, the fixing screw should be tightened so that its end is located in the groove between the two teeth of the adjusting ring. This prevents the adjusting ring from rotating and avoids applying radial pressure to it. For safety, before adjusting the adjusting ring, the inlet pressure of the safety valve should be appropriately reduced (generally to below 90% of the opening pressure) to prevent the valve from suddenly opening during adjustment and causing an accident.

③ For structures with upper and lower adjusting rings (one on the guide sleeve and one on the valve seat), the adjustment is more complex. The valve seat adjusting ring is used to change the size of the passage between the valve disc and the adjusting ring, thereby changing the degree of pressure accumulation in the chamber between the valve disc and the adjusting ring when the valve initially opens. When the valve seat adjusting ring is raised, the degree of pressure accumulation increases, thus reducing the proportional opening stage of the valve and allowing for a faster, sudden, rapid opening. Therefore, raising the valve seat adjusting ring can reduce the discharge pressure. It should be noted that the valve seat adjusting ring should not be raised too close to the valve disc. In this case, leakage at the sealing surface may cause the valve to open prematurely and suddenly. However, since the medium pressure is insufficient to hold the valve disc in the open position at this time, the valve disc immediately closes again, resulting in frequent valve tripping. The valve seat adjustment ring is mainly used to reduce the valve's proportion, the opening stage, and regulate the discharge pressure. It also affects the reseating pressure.

The upper adjustment ring is used to change the angle at which the flowing medium reflects off the lower side of the valve disc, thereby changing the magnitude of the fluid force and thus regulating the reseating pressure. Raising the upper adjustment ring decreases the turning angle, and the fluid force decreases accordingly, thus increasing the reseating pressure. Conversely, lowering the upper adjustment ring decreases the reseating pressure. Of course, while changing the reseating pressure, the upper adjustment ring also affects the discharge pressure; raising the upper adjustment ring slightly increases the discharge pressure, and lowering it slightly decreases the discharge pressure, but its effect is not as significant as that of the reseating pressure.

Safety valve seal:

After the safety valve is adjusted, it should be sealed with a lead seal to prevent unauthorized changes to the adjusted state. When overhauling a safety valve, the positions of the adjusting screw and adjusting ring should be noted before disassembling the valve to facilitate adjustments after overhaul. After readjustment, the valve should be resealed.

AVENTICS Group is a global provider of pneumatic components and automation systems. It is also a professional supplier of drive and control solutions for the marine industry, oilfield equipment, and commercial vehicles. Formerly the pneumatics business unit of Bosch Rexroth, the company now operates independently worldwide.

AVENTICS' main products include: actuators and accessories, gripping and vacuum systems, positioning technology, valves and accessories, valve islands and bus systems, proportional technology, air handling units, fittings and accessories, sensors and pressure switches, pneumatic system control technology, marine electronic control systems, and toothed chains.

AVENTICS' main application industries include: factory automation, commercial vehicles, food and beverage, rail transportation, life sciences, and energy.

Adjustment of opening pressure:

Safety valves

① Before leaving the factory, each safety valve should have its opening pressure adjusted to the user's required set value. ① If the user specifies a spring working pressure rating, the valve should generally be adjusted to the lower limit of that rating at the factory.

② Before installing the safety valve onto the protected equipment, or even before installation itself, the user must readjust it at the installation site to ensure the set pressure value meets requirements.

③ Within the spring working pressure rating range specified on the nameplate, the opening pressure can be adjusted by rotating the adjusting screw to change the spring compression.

④ Before rotating the adjusting screw, the valve inlet pressure should be reduced to below 90% of the opening pressure to prevent the valve disc from rotating and damaging the sealing surface.

⑤ To ensure accurate opening pressure, the medium conditions during adjustment, such as medium type and temperature, should be as close as possible to the actual operating conditions. Changes in medium type, especially when the medium's accumulation state changes (e.g., from liquid to gas), often result in changes in opening pressure. Opening pressure generally decreases as operating temperature increases. Therefore, when adjusting at room temperature for use at high temperatures, the set pressure value at room temperature should be slightly higher than the required opening pressure value. The required level depends on the valve's structure and materials; the manufacturer's specifications should be consulted.

⑥ Conventional safety valves are used for:

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AVENTICS Pneumatic Valve R414000729 E/P Pressure Regulating Valve, Series ED12 The company mainly deals with 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, ROSS

British brands: Norgren

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