416E Backhoe Loader Hydraulic and Steering System Caterpillar


Makeup and Relief Valve

Usage:

416E BWC

补偿和安全阀(如有配备)

管路安全阀关闭位置




图 1g01278641

(1) 腔室

(2) 油道

(3) 安全阀弹簧

(5) 阀座

(6) 提升阀

(7) 阀体底座

管路安全阀安装在控制阀中,以便在机器操作期间保护液压系统。 如果有外力作用在系统上引起压力异常高,管路安全阀将打开。 在闭合位置时,阀在安全阀弹簧 (3) 的力和腔室 (2) 中的压力作用下落座。 这将保持阀就座。 阀保持在闭合位置,直至压力增加。

管路安全阀打开位置




图 2g01278642

(1) 腔室

(2) 油道

(3) 安全阀弹簧

(5) 阀座

(6) 提升阀

(7) 阀体底座

当通道 (2) 中的压力超过弹簧 (3) 的设置时,管路安全阀将打开。 提升阀 (6) 压缩弹簧 (3) ,同时提升阀移至左边以使阀座 (5) 离座。 这将允许通道 (2) 中的多余压力进入腔室 (1) 。 腔室 (1) 中的机油流回油箱。 恢复正常工作压力后,阀将落座。 这将保持阀闭合。

补偿闭合位置




图 3g01278699

(1) 腔室

(2) 油道

(4) 补偿弹簧

(5) 阀座

(7) 阀体底座

补偿阀安装在控制阀中以避免系统出现极低压力或气穴。 低压或气穴将导致油缸运动响应慢。 补偿阀防止出现气穴。 当腔室 (2) 中的压力和补偿弹簧 (4) 的压力超过腔室 (1) 中的压力时,补偿阀闭合。 补偿弹簧 (4) 和腔室 (2) 中的压力保持阀座 (5) 抵着闭合位置的阀体底座 (7) 落座。

补偿开启位置




图 4g01278702

(1) 腔室

(2) 油道

(4) 弹簧

(5) 阀座

(7) 阀体底座

当腔室 (2) 中的压力降至低于腔室 (1) 中的压力时,将会出现真空。 当腔室 (1) 中的压力克服腔室 (2) 中的压力和弹簧 (4) 的压力时,阀将开启。 阀座 (5) 离开阀体底座 (7) 。 这将允许机油从腔室 (1) 流入腔室 (2) 。 腔室 (2) 中的压力大于腔室 (1) 中的压力时,弹簧力将关闭阀。 补偿阀用于防止出现气穴。 该阀一直保持压力以便操作正常。

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