Butterfly valve applications Turbine inlet valve shall be installed when the hydro-generating unit with a tube multi-machine or diversion steel pipe is too long. If more than one machine, the installation of the inlet valve units put into operation should not affect the normal work of the various units share an intake penstocks. Diversion of steel pipe is too long, the installation of the inlet valve conventional over-speed protection to refuse to move when truncated flow can be encountered in unit accident load rejection, to protect the unit, or load rejection unit accident and had met with the failure of the governor truncated protection of water on the unit, but also can reduce the force of the water hammer serious damage to the turbine guide water bodies. Ni'erji hydropower turbine inlet valve Model PDF92-WY-500, the diameter of 5000mm, the diameter of the inlet valve for oversize valves in the country. The composition and role of the 2 systems 2.1 flow control valve
Inlet butterfly valve system consists of double sealing liquid moving butterfly valves, hydraulic drive system, electrical control systems and ancillary equipment. The basic form of the hydraulic dual sealing butterfly valve double eccentric horizontal shaft double seal structure, divided into two sealed sealing and maintenance sealed; hydraulic drive system consists of hydraulic station and operating mechanism, each inlet valve is equipped with a hydraulic Station operating mechanism in pressure single servomotor; as the core control system with PLC and touch screen operation and display, can be operated or remote control; downstream side of the inlet valve of one expansion joint, to facilitate the installation of the inlet valve disassembly and overhaul. The 2.2 dual seal inlet valve main role Close the inlet valve, truncated turbine inlet to facilitate turbine overhaul; hydraulic turbine speed control system failure, the unit speed increases in the case of setting the value of active water emergency shut valve, ensure unit safety; long-term shutdown when turbine units when truncated upstream runoff, reducing leakage guide vanes, to prevent the unit occurred peristaltic; to overhaul double sealing butterfly valve shaft end sealing and sealing pressure water not emptying valve before, and does not affect the normal operation of the other units. 3 pneumatic control valves
Inlet valve move equivalent to a liquid inlet valve and a water service valve. It has two downstream sealing device inlet valve water side set to work sealing pair, set in the influent end overhaul seal pair. Work properly sealed when the only work put into use; work seal or shaft end sealing needs an overhaul, and does not affect the normal operation of other units, in order not to drain the penstock, repair the seal to work. The work of sealing to preload adjustable mature technology, hard rubber - stainless steel sealing structure. Valve seals high hardness rubber ring, the overall sulfide, seamless connectivity, gland and stainless steel screws fixed to the shutter on the valve sealing pressure than through the screw adjustment required. Meanwhile, in the case without disassembly of the valve body, it is convenient to repair or replace the seals. When the shutter is fully closed, the hydraulic pressure under the action, the rubber seals more securement valve seals, so that a better sealing effect. Overhaul sealed using a mobile form of self-sealing metal hard seal structure. Body seal for dynamic seal ring with cone form of valve seals from the sealed spherical seal rings. Overhaul seal inputs, spherical seals in the water pressure expands outward, to get reliable than the pressure seal. Dynamic seal ring valves before hydrostatic drive, and equipped with a supercharger device has a dynamic seal ring position indicating mechanism, and the outside of the valve. When the valve is rotated, the dynamic seal ring out of first, the two sealing surfaces rotating friction, small opening torque. The service seal carbide metal hard seal structure and does not participate in the work of the unit is working properly, and only maintenance work seal and the shaft end seal when put into use, wear-resistant, the useful life of greater than 20 years. 4 inlet valve hydraulic control part PDF92-WY-500 inlet butterfly valve hydraulic control system mainly by the high pressure fuel pump plunger two electromagnetic relief valve, solenoid valve, two pilot-operated check valve, two electromagnetic ball valve, a Cartridge valve, auxiliary equipment and components of the the accumulator group, the main valve hydraulic cylinders, lock ingots hydraulic cylinder, hydraulic cylinder bypass valve and the oil system. The hydraulic drive system consists of hydraulic station and operating mechanism. Hydraulic station pump unit, integrated MANIFOLDSHYDRAULIC, fuel tank, air filter, oil filter, pressure transmitter, hydraulic transmitter, control valve and meter. Each inlet valve with hydraulic stations. On the tank is equipped with two sets of high-pressure piston pump motor group, 2 sets of spare each accumulator tank to ensure a reliable hydraulic energy supply and, when necessary, the pump unit may be directly to the inlet valve to provide a power source. The basic principle is the inlet valve hydraulic control system components: hydraulic station through the pump unit to the air bag type accumulator oil-filled to produce compressed energy or stored hydraulic energy storage in the role of the command and control of the electric control valve group the tank of hydraulic oil through hydraulic valve fast flow to the operating mechanism, and the hydraulic energy into mechanical energy, and the operation of kinetic energy of the inlet valve is thus achieved in the process of driving the main relay device, locking the relay device and the bypass valve servomotor. 5 control system The influent hydraulic dual sealing butterfly valve control system as the core of a PLC (programmable logic controller), industrial man-machine interface operation and display (touch screen). May operate the inlet valve, the opening and closing of the bypass valve may also be in the control room for the entire inlet valve system for automatic control. You can also provide remote computer diagnostics, consulting and other services. 1) the use of a variety of sensors to detect the pressure of the hydraulic system, oil temperature and the valve's position, by PLC or computer monitor, and analyze the operating status of the inlet valve system, raised the alarm information automatically take urgent measures. 2) industrial man-machine interface (touch screen), the operation of the valve is more intuitive, more convenient, a greater amount of information displayed. Can get the dynamic pressure of the system through the touch screen, dwell time, number of starts of the oil pump motor, each run time, hydraulic oil temperature, oil tank level, the current position of the valve opening and closing time, fault alarm information can also query inlet valve system operating guide, technical data, maintenance wizard. 3) with the intake valve system control interface to communicate with the central control room, into a centralized control system of hydropower. Unattended, fewer people on duty. 4) use of remote communication interface, signal transmission via public telephone line with a remote host computer, can not only achieve remote monitoring or management, but also to achieve the factory remote technical services for users. 5) The large butterfly valves since the run since running stable, no abnormality in the process of closing valves, leaking almost 0 reliable emergency action.