译文：
1、QPF-F50型气动平衡阀又称主减压阀，用于气动回路中，对压缩空气的压力值进行调节，使设定的压力值近于恒定。 2、该阀是调压溢流组合阀。当出口压力低于设定压力时，起调压阀的作用，使压力上升至设定压力。当出口压力高于设定压力时，起溢流阀的作用，使出口压力下降至设定压力。从而保证出口压力始终稳定在所需要的设定压力上。 3、由于该阀同时具有调压阀和溢流阀的特性，故可同时代替调压阀和溢流阀进行工作，比在气路系统中单独设置调压阀和溢流阀，系统简化、结构紧凑。同时也xx了调压阀和溢流阀之间设定压力差，保证系统中的空气压力能更准确地调节并稳定在所需要的设定压值上。 4、该阀属于具有出口压力反馈的气控调压溢流组合阀，在没有先导信号输入时，处于常闭状态。当先导气路的压缩空气进入B腔后，此阀开始工作。输出压力的高低，由进入先导气口CP的气压来控制，通过调整其压力来设定出口压力。由CP口进入控制腔B的压缩空气，推动活塞连同其上的阀芯一起沿轴向向上移动，克服弹簧7的力，使其压缩。当阀芯6的溢流阀口(即上端面)与阀盖3的底面xx接触后，输出与溢流的通道被隔断。活塞继续上移、阀芯将阀盖沿轴向向上推移，并使阀盖上的弹簧压缩，调压阀口被打开，输入腔与输出腔连通，输入腔的压缩空气经调压口进入输出腔，经OUT口输出。输出腔的压缩空气经阀体上的2条气路进入A腔和C腔。3个腔体内的气体的压力是相同的。 5、当输出压力低于设定值时，活塞下侧的力大于上侧，活塞向上移动，推动阀盖3上移，使调压阀口加大，由调压阀口进入输出腔的压缩空气的流量加大，输出腔的压力则随之上升。当输出腔的压力达到设定值时，活塞上、下两侧所承受的力处于平衡状态，活塞停止上移，调压阀口的开度保持不变。输出口输出压缩空气的压力和流量保持稳定。 6、当输出压力高于设定压力时，活塞上侧的作用力大于下侧，阀盖和活塞一起向下移动，使调压阀口开度减小，经调压阀口进入输出腔的气体的流量减小，则输出腔的气体的压力下降。若此时输出腔的压力仍高于设定值，则活塞仍继续向下移动，直至调压阀口xx关闭。此时阀盖上弹簧1的力不再通过阀芯作用在活塞上，而是使阀盖底面的胶垫紧紧地压在调压阀口上，输入腔与输出腔之间通路被隔断。此时，如果输出压力等于设定压力值，则活塞停止运动。此时设定压力就是在调压阀口与溢流阀口同时关闭，阀处于静平衡状态时的出口压力。 7、若输出压力仍高于设定压力值，活塞继续向下移动，溢流阀口即阀芯的上端面与阀盖3的底面脱离，输出腔与溢流腔连通，输出腔内气体经溢流阀口通过EX口排出。随着输出腔内压力的下降，C腔内压力亦同时下降，活塞下侧的压力高于上侧，使活塞B与阀芯一起沿轴向向上移动逐渐关小溢流阀口的开度。当输出压力达到设定值时，溢流阀口与阀盖底面xx贴合，输出腔与溢流腔之间通路被隔断，溢流停止。此时，溢流阀口与调压阀口同时关闭，阀处于气体停止流动的静平衡状态。由于阀盖上、下侧所受气压处于相互抵消的平衡状态，所以，无论进气口(IN)的压力如何波动，都不能影响阀内压力平衡，因而能够确保出口压力始终稳定在所需要在设定值上，使阀具有良好的压力特性。

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原文：
1, QPF-F50 Pneumatic Valves, also known as the main valve for the pneumatic circuit, compressed air pressure value on adjustments to the set pressure value of nearly constant. 2, the overflow valve is a pressure regulator valve combination. When the outlet pressure below the set pressure, play the role of regulators, so that the pressure up to set pressure. When the outlet pressure above the set pressure, relief valve from the role of pressure drop in exports to the set pressure. To ensure stability of the outlet pressure is always set at the required pressure on. 3, since the valve has a pressure regulator and relief valve also features, it can also replace the pressure regulator and pressure relief valve to work, than in the gas system in a separate set pressure regulating valve and pressure relief valve, the system simplified compact. Also eliminates the pressure regulating valve and pressure relief valve set pressure difference between the guarantee system, the air pressure can more accurately adjust and stabilize at the required pressure value on the set. 4, the valve is a gas outlet pressure feedback control regulator overflow valve combination, in the absence of pilot input signal, is normally closed state. When the pilot gas line after the compressed air into the chamber B, the valve work. The level of output pressure from the air intake into the pilot air pressure to control the CP, by adjusting the pressure to set the outlet pressure. Port from the CP into the control cavity B of the compressed air, push the spool piston together with its upward movement along the axis, the force to overcome the spring 7, so the compression. When the spool of the relief valve 6 (ie the upper end) and the valve cover completely the bottom 3 after contact with the overflow of the channel output is cut off. Pistons continue to move up, spool valve cover will be up along the axial passage, and to cover the spring compression valve, pressure regulating valve port is opened, the input cavity and output cavity connected, enter the chamber of compressed air into the opening by the regulator output cavity through the output port OUT. The output of compressed air through the valve body cavity of the two gas path into the A and C chamber cavity. 3 the pressure of the gas chamber is the same. 5, when the output pressure drops below the set value, the piston lower side than on the side of the force, the piston moved up, push 3 on the shift valve cover, so that regulators population increase, the pressure regulating valve port into the output cavity compressed air flow to increase the output cavity pressures rise. When the output cavity pressure reaches the set value, the piston, the lower the force borne by both sides in balance, the piston to stop the move, regulators mouth opening remains unchanged. Output output compressed air pressure and flow stability. 6, when the output pressure is higher than the set pressure, the piston side force than the lower side, with the valve cover and the piston moves down, so that regulators reduced mouth opening, mouth into the output cavity by regulators the gas flow decreases, the output pressure of the gas chamber decreased. If the output cavity at this time the pressure is still higher than set value, the piston continues to move down until the pressure regulator mouth completely closed. At this point valve spring cover is no longer a force acting on the piston through the valve, but on the underside of the pad to valve cover tightly pressed regulators mouth, enter the path between the cavity and output cavity was cut off. At this point, if the output pressure equals the set pressure value, the piston stops campaign. At this point I set the pressure regulating valve and pressure relief valve is in the mouth and closing the valve in a static equilibrium state of the outlet pressure. 7, if the output pressure is still higher than the set pressure value, the piston continues to move down, the relief valve port spool valve cover on the face and the bottom 3 from the output chamber and overflow chamber connected via the output cavities EX discharge port through the relief valve port. With the decline in the output chamber pressure, C cavity pressure also decreased, the piston on the lower side of the pressure is higher than the side of the piston along the axis B along with the spool gradually moving up off the mouth of a small relief valve opening. When the output pressure reaches the set value, the relief valve port and valve cover bottom completely fit, the output path between the chamber and overflow chamber was cut off, overflow stop. At this point, relief valve and pressure regulating valve port while closing the mouth, at the gas valve to stop the flow of static equilibrium. As the valve cover, suffered under the pressure side of the balance is offset, so no matter intake (IN) how the pressure fluctuations can affect the pressure balance valve, which can ensure that the outlet pressure has stabilized at the required set value, so that the valve has good pressure characteristics.