性能
FUNCTION

• 通常处于关闭位置，当压力达到设置点时开启
  Normally closed position, opens when pressure reaches set-point.

性能
FEATURES

• 响应能力：
  Responsive:
  • 可选择弹簧作用范围，以便更精确、更容易地调节压力设置
    Selectable spring ranges to allow for accurate, easy to adjust pressure setting.
    • 大隔膜面积
      Large diaphragm area
    • DN15和DN20端口
      1/2" and 3/4" ports.
    • 大阀座面积
      Large seat area
• 易于维护
  Ease of Maintenance
  • 不需要从管线上拆卸即可进行维修。
    Can be serviced without removal from
    line.
  • 最需要维修的通常只是更换合成橡胶部件。
    Replacement of elastomer parts is usually
    maximum required servicing.

工作原理
OPERATION

　　PV20CB是一种通常处于关闭状态，隔膜驱动，弹簧负载，直接作用的调节阀。压力设置点在弹簧作用范围内是可调节的。上游压力在隔膜下被感应到。当上游压力增加，隔膜就像弹簧施加推力。这时引导杆/阀座就被推向开启位置，通过引导增加流量。当隔膜下的上游压力降低时，弹簧就将阀杆/阀座反推向关闭位置，限制流体通过引导装置。这种灵敏的弹簧/隔膜紧密交互作用过程和响应，改变了上游压力。
　　The PV20CB is a normally closed, diaphragm actuated, spring loaded, direct acting regulator. The pressure set point is adjustable within the spring range. Upstream pressure is sensed under the diaphragm. As upstream pressure increases, the diaphragm pushes against the spring. The pilot stem/ seat is pulled towards the open position, increasing flow through the pilot. As upstream pressure decreases under the diaphragm, the spring pushes the stem/seat towards the closed position restricting flow through the pilot. This sensitive spring/diaphragm interaction closely tacks and responds to changes in upstream pressure.

启动/调节
START-UP/ADJUSTMENT

　　按照所选择的ACV性能的启动程序进行操作。
　　Follow the start-up procedures for the ACV function you have selected.

1. 顺时针方向旋转螺丝（IN），上升正在控制的设置点。
   Turn the screw Clockwise (IN) to increase the set-point you are controlling.
2. 逆时针方向旋转螺丝（OUT），降低正在控制的设置点。
   Turn the screw Counterclockwise (OUT) to decrease the set-point you are controlling.

安装
INSTALLATION

　　如果PV20CB是在现场安装，则按照下列步骤进行。
　　If the PV20CB is to be field installed, follow the steps below.

1. 找出流向箭头或桥形标志并安装控制阀，使其流体是从阀座下方流过。
   Locate the flow arrow or bridge marking and install the control so the flow is under the seat.
2. 典型应用如右侧所示：
   Typical application shown to the right: