PRODUCTION • PROCESSING • HANDLING
Te gearbox of the actuator is
watertight and maintenance-free. Te actuating forces are absorbed linearly and without torsion in the nickel-coated, fully welded cylinders. Te piping and unions are in stainless steel. Te compact Scotch-yoke design of the actuator permits the gearbox to consist of just two housing halves, which are divided horizontally in the middle. Te housing halves are of high-strength grey cast iron and are manufactured so that they can hold the actuator lever and the actuator cylinders at the same time without additional unions. Special sealing agents are
inserted when the housing halves are put together. Tese seal the gearboxes hermetically and prevent the ingress of water and air. An excess-pressure safeguard in the housing prevents an impermissible increase in pressure in the case of overheating caused externally. In addition, the gearbox is completely filled with a special fluid grease that ensures that all the mechanical actuating parts are lubricated optimally and protected against corrosion. Further advantages of this special fluid grease are that the unit is maintenance-free and that its high level of efficiency is also retained following extended down-times.
CONTROL COMPONENTS Te control components are accommodated in a stainless steel cabinet and are thereby protected against external environmental factors. Te main components of the control device are executed in leakage-free control block technology. Tere are two redundantly arranged high pilots and one low pilot. A reconnection device permits the high pilots to be activated under line pressure. For setting the pilots on site, the control device has an integrated test device. Two high-pressure rapid venting devices arranged redundantly ensure fast closing (≤ 5 seconds.). All components associated with the control of the system are produced in a corrosion-resistant form.
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Te control and main valves are executed as leakage-free seat valves in block mode of construction, which permits them to be exchanged simply and rapidly. Te piping in the cabinet, which is kept to the minimum necessary, is of stainless steel with Swagelok unions.
MODE OF FUNCTIONING
Te SSU opens automatically when both of the rapid venting devices of the control unit are
Each unit consists of a ball valve with full passageway, a simple action, spring-closing actuator and a gas-high-pressure control with two high pilots and one low pilo
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