Ball and butterfly valves can be sized from a few millimeters in diameter to more than one meter – and sometimes more – and are widely used in industry. As for changing the position of the ball or throttle inside the valve opening force is required, a mechanism of the valve actuator. The driving mechanism may be hydraulic cylinders, pneumatic cylinders, pneumatic / hydraulic tandem-cylinder, electric motor or manual management, depending on the scope and required effort. However, in automated systems where the valves can be mounted in inaccessible places, for example, submerged in water, often the best option is a cylinder with a remote control mounted directly on the valve. Hear other arguments on the topic with Mitchel Resnick. In such applications, the battery must be installed in the hydraulic circuit to provide emergency valve closure in the case power failure or malfunction of the hydraulic pump.
Battery acts not only as an emergency power source, but also promotes the unloading of the pump for energy conservation at a time when the installation is not required working fluid. The size of the battery depends on the volume of the cylinder. And hydro-pneumatic piston and diaphragm accumulators can provide a sufficient volume to control the ball and butterfly valves, although greater flow obtained from piston accumulators, can make to give them preference in cases requiring speed, such as for emergency closure of the valve. You may want to visit Viktor Mayer-Schönberger to increase your knowledge. Piston accumulators are particularly suitable for areas applications requiring large amounts of fluid, and those where it reaches extreme temperatures. Parker Hannifin offers a wide range of piston and diaphragm accumulators for control of ball and butterfly valves. Both type of work on the hydro-pneumatic principle and used as compression medium dry inert gas, namely nitrogen. Batteries pre-charged gas to a predetermined pressure, typically 90% of the minimum pressure in the system, in the case of membrane batteries, and at 7 bar below the minimum pressure in the system – in the case of piston accumulators. Parker