Abstract: This paper introduces the series design of the hydraulic control and electrical control of hydraulic actuator of fast closing butterfly valve. Keywords: fast closing butterfly valve; Hydraulic actuator; Series design 1 Overview Extraction steam turbine can be combined with the heat and power plant is widely used in thermal power plant heating system, in order to prevent the steam turbine steam extraction pipe reflux and condensation back to the water, triggering Turbine speeding accident, in the steam turbine exhaust pipe between the cut-off valve and the check valve to be installed fast off the butterfly valve to instantly cut off the pipeline to protect the safety of steam turbines. Due to the fast closing speed (<1s) and the large output force (> 100kN), the quick closing butterfly valve must use the hydraulic driving device. In order to adapt to various types of valves, the quick closing butterfly valve hydraulic driving device has been serially designed. 2 Structure Fast closing butterfly valve hydraulic drive device consists of 5 parts of the hydraulic pump station, control valve group, accumulator, fast fuel tank, electrical control box (Figure 1), which can complete the butterfly valve slow open, slow off, Activities and other activities. Figure 1 quick closing butterfly valve hydraulic drive device appearance (1. Electrical control box 2. Accumulator 3. Hydraulic pump station 4. Control valve group 5. Quick cylinder) 2.1 Hydraulic control part According to the requirements and calculation of quick closing butterfly valve, hydraulic The basic parameters of the drive are determined as "Table 1". "Table 1" The basic parameters of hydraulic equipment Parameter Series 1 Series 2 Tank volume V / L 50 80 Rated flow rate qm / L * min 2.0 3.0 Working pressure p / MPa 13 ~ 16 15 ~ 18 Pressure holding capacity 4h Pressure drop is not more than 2MPa Valve opening time 10 ~ 30s (0 ~ 90 °) Adjustable valve closing time 10 ~ 30s (90 ~ 0 °) Adjustable quick opening valve time <0.5s (Including the buffer time is less than 1s) Filtration precision 10μm Accumulator pre-pressure py / MPa 8.0 ± 10% 9.0 ± 10% working medium N46 ~ N68 anti-wear hydraulic oil hydraulic pump station by the motor, coupling, hydraulic pump, into the oil filter, high pressure filters, fuel tanks and other components, the main The function is to supply the system with the required pressure oil, to provide flow and pressure for the accumulator. The design adopts imported high pressure and low noise gear pump, the pump device adopts the vertical installation and inverted structure of high pressure filter, compact structure, The system oil clean to ensure that all kinds of control valve can be normal operation. To meet the needs of different fast closing butterfly valve, divided into two series to design. Fig. 2 Hydraulic control valve set (1. Solenoid valve DT3 2. Solenoid valve DT2 3. Shut-off valve AV1 4. Shut-off valve AV3 5. Shut-off valve AV2 6. Relief valve RV 7. Pressure measuring connector MP 8. Shut-off valve AV4 9 Pressure switch KP2 10. Pressure switch KP1 11. Solenoid valve DT1) The control valve set (Fig. 2) is mainly composed of valve block, relief valve, check valve, throttle valve, stop valve, solenoid valve, pressure relay and pressure gauge Etc., relief valve RV role is to set the system safety pressure, globe valve AV1 role is to release the system pressure oil back to the tank, the role of throttle valve AV3 is to adjust the system off valve speed, the role of throttle valve AV2 is to regulate The system opens the valve speed, the function of the pressure relay KP2 is to set the upper limit of system hydraulic control, the function of the pressure relay KP1 is to set the system hydraulic control lower limit point, the pressure gauge's function is to demonstrate the system hydraulic pressure, in order to reduce Leakage and pump start-up times, energy saving, easy maintenance and installation, the selection of the imported threaded cartridge valve and the quality of two-way cartridge valve. In order to meet the needs of different fast closing butterfly valve, the valve block is divided into three parts, namely the left valve block, the middle valve block and the right valve block, to design different combinations to meet different requirements. The accumulator provides energy for the butterfly valve to open, slow, fast and activities such as movements, the selection of accumulator specifications through rigorous calculations, each system is different, in order to meet the system pressure and the butterfly valve fast closing requirements. The nitrogen used in the accumulator can be regarded as the ideal gas, and the rapid expansion and compression process can be regarded as the adiabatic state change. The formula for calculating the total volume of the accumulator to be used is as follows: Where: V0 - accumulator Ideal total volume, m3ΔV-- effective oil displacement required for accumulator, m3P0-- accumulator inflation pressure (absolute pressure), PaP1-- system minimum working pressure (absolute pressure), PaP2-- system maximum working pressure (Absolute pressure), PaK - gas variable index (variable index of nitrogen K = 1.4) Figure 3 fast cylinder fast cylinder (Figure 3) is driven by the gear rack butterfly valve actuator, in order to ensure its reliable operation, Cylinder seal selection of imported seals, and set up a hydraulic buffer device to protect the butterfly valve, designed throttling device, according to the system control drive external load, directly mounted on the rack and pinion. In order to better connect with the quick closing butterfly valve, the quick cylinder has also made a series of design, see "Table 2". Table 2 Parameters of quick cylinder Cylinder Specification Model d M D1 M1 L1 L2 L3 LD M2 φ40 / 25 × 95 66 M20 × 2 85 M8 80 50 5 250 105 M18 × 115 φ40 / 25 × 126 66 M20 × 2 85 M8 80 50 5 280 105 M18 × 115 φ50 / 28 × 126 72 M24 × 2 92 M10 100 65 5 300 112 M22 × 115 φ50 / 28 × 157 72 M24 × 2 92 M10 100 65 5 350 112 M22 × 115 φ63 / 35 × 157 80 M30 × 2 100 M10 110 70 10 380 120 M33 × 2 φ63 / 35 × 189 80 M30 × 2 100 M10 110 70 10 420 120 M33 × 2 φ80 / 45 × 189 90 M42 × 2 110 M12 120 80 10 440 135 M42 × 2 φ80 / 45 × 220 90 M42 × 2 110 M12 120 80 10 480 135 M42 × 2 2.2 Electrical control section According to the requirements of the hydraulic control section, determine the parameters of the electrical control system, see "Table 3". Table 3 Basic Parameters of Electrical Control System Parameter Series 1 Series 2 Motor Power P / kW 1.1 1.5 Switching Power Supply 60W Control Voltage DC 24V Power Input Three-phase Four-wire AC 380V / AC 220V ± 10%, 2kW Control Power AC 220V ± 10% fast closing butterfly valve hydraulic drive electronic control system uses a dedicated integrated design of printed circuit boards, rigorous testing proved that the circuit board easy to adjust, stable performance, reliable quality. Electric control box by the switching power supply, AC contactor, thermal relays, circuit breakers, circuit boards and terminals and other components. Electric control sub-ordinary relay control box and PLC-type electric control box two. 3 model The electro-hydraulic control drive model consists of 9 units, used to indicate the device code, the nominal valve diameter, the valve nominal pressure, energy storage form, fast off action form, with manual action, with the oil source system, Electrical options and product version number. 9 units of the device model are arranged in the following order: ①Product Code - HGKG, Electro-hydraulic fast-closing butterfly valve electro-hydraulic control drive device; ② Valve nominal diameter - DN200, DN250, DN300, DN350, DN400, DN450, DN500, DN550, DN600, DN650, DN700, DN750, DN800, DN900, DN1000, DN1.00, DN1200, DN1300, DN1400, DN1500, DN1600, DN1800, DN2000; PN25, PN40, PN50, PN63.3; ④ energy storage form - X is the accumulator type (default option), T is spring type; ⑤ fast closing action form - E is the electric action (default option) D is a loss of power; ⑥ with manual action - S (accumulator type); ⑦ with oil system - P (spring type); ⑧ electrical options - PT for the common relay control type ), XD is PLC control type; ⑨ Product version number - 2X, 3X; Example: HGKG①- 450 ② / 06 ③ - X ④ - E ⑤ - S ⑥ / P ⑦ - PT⑧ - 2X ⑨ 4 Conclusion Fast shutoff valve electro-hydraulic control drive after several After optimizing the design, both Now the remote control, but also to achieve control of the local operator control panel box. Through the selection of imported high-pressure low-noise gear pump, high-pressure high-flow logic valve, a compact screw-in cartridge valve and a dedicated control circuit board, the fast closing speed can reach 0.3s, and stable and reliable operation. Valve Address: Valve Gate Valve Globe Valve Hydraulic Control Valve Butterfly Valve Check Valve Plug Valve Regulating Valve Trap Reducer Filter Tank Capacity V / L5080 Rated Flow qm / L * min2.03.0 Working Pressure p / MPa13 ~ 1615 ~ 18 Pressure performance 4h Pressure drop less than 2MPa Valve opening time 10 ~ 30s (0 ~ 90 °) Adjustable closing valve time 10 ~ 30s (90 ~ 0 °) Adjustable quick opening valve time <0.5s (Including the buffer time is less than 1s) Filtration accuracy 10μm Accumulator pre-pressure py / MPa8.0 ± 10% 9.0 ± 10% Working medium N46 ~ N68 anti-wear hydraulic oil φ40 / 25 × 9566M20 × 285M880505250105M18 × 115φ40 / 25 × 12666M20 × 285M880505280105M18 × 115φ50 / 28 × 12672M24 × 292M10100655300112M22 × 115φ50 / 28 × 15772M24 × 292M10100655350112M22 × 115φ63 / 35 × 15780M30 × 2100M101107010380120M33 × 2φ63 / 35 × 18980M30 × 2100M101107010420120M33 × 2φ80 / 45 × 18990M42 × 2110M121208010440135M42 × 2φ80 / 45 × 22090M42 × 2110M121208010480135M42 × 2 Motor Power P / kW1 .11.5 switching power supply 60W control voltage DC 24V power into the line three-phase four-wire AC 380V / AC 220V ± 10%, 2kW control power AC 220V ± 10%