The VG… gas valves with their electro-hydraulic SKP70... actuators are designed for use with gas families I, II, III and with air. They are used primarily in gas-fired combustion plant. The actuators open slowly and close rapidly. All types of VG… gas valves can be combined with the SKP70... actuators which are fitted to the valve body by means of 4 screws contained in the terminal compartment. The square flange can be turned in steps of 90°, thus offering a choice of 4 different mounting positions. The actuator can be mounted or replaced while the valve is under pressure. Sealing materials are not required. The SKP70... features an integrated precision gas pressure controller. This type of actuator with its integrated controller not only reduces the length of the gas train, but usually also permits the selection of a smaller valve size (refer to Flow chart in the valve′s data sheet). The actuator can also be supplied with limit or auxiliary switches, e.g. for indicating the fully closed position.
The SKP70... for use with forced draught gas burners controls the pressure of the combustion air so that the gas to air ratio remains constant over the entire output range (shifting the setpoint by the static pressure of the combustion air). Changes in the air volume caused by voltage fluctuations, dirty fan wheels and the like have therefore no impact on the quality of the combustion process – in contrast to conventional ratio control. Using the SKP70..., deviations from the correct gas to air ratio caused by varying pressures in the combustion chamber can be eliminated in a straightforward manner. To accomplish this, the SKP70... can be connected to the combustion chamber via an additional impulse pipe, using the combustion chamber pressure as a disturbance ＆#118alue.
产品列表
Baltur百得燃烧器
产品展示 >> SIEMENS燃气电磁阀