☆：G761-3008B 帶模擬量接口流量控制閥
G761/-761 系列流量控制伺服閥是可用作三通和四通節(jié)流型流量控制閥，用于四通閥時控制性能更好。該系列閥為高性能的兩級電液伺服閥，在每一節(jié)流邊35 bar(500psi)閥壓降下的額定流量為 0.5至75l/min(0.125 至19.5 gpm)。
該系列閥結(jié)構(gòu)簡單、堅固，工作可靠，使用壽命長。閥的先導(dǎo)級是一個對稱的噴嘴擋板力矩馬達。輸出級包含一個經(jīng)過精密研磨與閥套匹配的4邊滑閥芯，可實現(xiàn)性能。閥芯位置由一根硬質(zhì)合金反饋桿進行機械反饋至力矩馬達。反饋桿終端的硬質(zhì)合金球可確保高度準確性、可靠運行以及較長的使用壽命。穆格所有伺服閥即便是在最嚴苛的工業(yè)應(yīng)用中也可保證高度準確性并實現(xiàn)可靠運行，因此享有盛譽。
此類閥適用于具有較高動態(tài)響應(yīng)要求的電液位置、速度、壓力或力伺服控制系統(tǒng)。
G761/-761 系列可用于各類應(yīng)用場景，是伺服閥之，也是我們所熟知的 760 系列的型號。該系列產(chǎn)品傾入了穆格近 70 年的專業(yè)設(shè)計知識。
G761/-761系列流量控制伺服閥包含一個極化電動力矩馬達和兩級液壓動力放大裝置。馬達銜鐵伸入磁通回路氣隙中，在這里由一個彈簧管件支撐。彈簧管充當伺服閥電磁與液壓部分之間的密封件。銜鐵周圍包有2組馬達線圈，彈簧管兩側(cè)各一組。
級液壓放大器的擋板與銜鐵中心點剛性連接。擋板延伸穿過彈簧管并經(jīng)過兩個噴嘴之間，在噴嘴尖頭與擋板之間形成兩個可變節(jié)流小孔。由擋板和噴嘴可變節(jié)流小孔控制的壓力饋入第二級閥芯的末端區(qū)域。
輸入信號在銜鐵上感應(yīng)產(chǎn)生一個磁荷，帶動銜鐵和擋板偏轉(zhuǎn)。該組件繞彈簧管轉(zhuǎn)動，在增大一個噴嘴節(jié)流孔面積的同時減小另一個節(jié)流孔的面積。
這個動作產(chǎn)生的壓差將帶動閥芯運動。所產(chǎn)生的閥芯位移在反饋桿感應(yīng)產(chǎn)生一個線性力，方向與開始時輸入信號里的力矩正相反。閥芯持續(xù)運動，直至反饋桿的力與輸入信號里的力平衡。
第二級采用常規(guī)四通閥芯設(shè)計，其中閥的輸出流量在閥門固定壓降下與閥芯距零位位移成正比。一個懸臂反饋彈簧桿固定在擋板上，并與閥芯中心的一個開口合。閥芯移動導(dǎo)致反饋彈簧桿偏轉(zhuǎn)，然后在銜鐵/擋板組件上產(chǎn)生一個作用力。
G761-3002B
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G761/-761 series flow control servo valves are available as three-way and four-way throttling flow control valves for better control performance when used in four-way valves. The valves are high-performance, two-stage electro-hydraulic servovalves with a rated flow rate of 0.5 to 75l/min(0.125 to 19.5 gpm) at 35 bar(500psi) valve pressure drop per throttling edge.
The valve series has simple structure, strong, reliable operation and long service life. The pilot stage of the valve is a symmetrical nozzle flapper torque motor. The output stage contains a 4-sided spool that is finely ground to match the valve sleeve for optimal performance. The spool position is mechanically fed back to the torque motor by a carbide feedback rod. The carbide ball at the end of the feedback lever ensures high accuracy, reliable operation and a long service life. All MOOG servo valves have a reputation for high accuracy and reliable operation even in the most demanding industrial applications.
These valves are suitable for electro-hydraulic position, speed, pressure or force servo control systems with high dynamic response requirements.
The G761/-761 series can be used in a wide range of applications and is one of the most versatile servo valves and the latest model in the 760 series we are known for. The collection draws on Moog’s nearly 70 years of design expertise.
The G761/-761 series flow control servo valves contain a polarized electric torque motor and a two-stage hydraulic power amplifier. The motor armature extends into the air gap of the flux loop, where it is supported by a spring fitting. The spring tube acts as a seal between the electromagnetic and hydraulic parts of the servo valve. There are two groups of motor coils wrapped around the armature, and one group on each side of the spring tube.
The baffle of the first stage hydraulic amplifier is rigidly connected with the center point of the armature. The baffle extends through the spring tube and passes between the two nozzles, forming two variable orifice holes between the nozzle tip and the baffle. The pressure controlled by the baffle and the nozzle variable orifice is fed into the end area of the second stage spool.
The input signal induces a magnetic charge on the armature, which drives the armature and the baffle to deflect. The assembly rotates around a spring tube to increase the area of one nozzle orifice while decreasing the area of the other orifice.
The pressure difference generated by this action will drive the spool movement. The resulting spool displacement generates a linear force in the feedback rod in the direction opposite to the torque in the input signal at the beginning. The spool continues to move until the force of the feedback rod is balanced with the force in the input signal.
The second stage adopts the conventional four-way valve core design, in which the output flow of the valve under the fixed pressure drop is proportional to the displacement of the valve core from the zero position. A cantilever feedback spring rod is fixed to the baffle and meets an opening in the center of the spool. The spool movement causes the feedback spring rod to deflect, which then creates a force on the armature/baffle assembly.
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