产品描述 Product Description

进口压差旁通阀、恒定压差阀为压差旁通平衡阀，主要应用于空调系统供/回水之间，保证供/回水之间的压差在一个固定值，提高系统能量的利用率、降低噪音，以及防止过大压差对系统设备的损坏，其主要组成为主阀和压差向导阀。

The inlet pressure difference bypass valve and constant pressure difference valve are pressure difference bypass balance valves, mainly used in air conditioning systems between supply and return water to ensure a fixed pressure difference between supply and return water, improve system energy utilization, reduce noise, and prevent damage to system equipment due to excessive pressure difference. They mainly consist of a main valve and a pressure difference guide valve.

结构和主要零件材质 Structure and main component materials

压差旁通阀、恒定压差阀由主阀、导阀、针阀、球阀和过滤器等组成。由于导阀、针阀和球阀等要用导管与主阀相连接，所以统称为外接导管控制系统，按不同通径的需求，可分隔膜式和活塞式，如下图所示。

The differential pressure bypass valve and constant differential pressure valve are composed of the main valve, pilot valve, needle valve, ball valve, and filter. Due to the need to connect the guide valve, needle valve, and ball valve with the main valve through a conduit, they are collectively referred to as external conduit control systems. Depending on the requirements of different diameters, membrane and piston types can be separated, as shown in the following figure.

主要零件材质 Main component materials

工作原理 working principle

进口压力P1通过导阀和针阀进入主阀的控制室，并建立向下的压力P3。出口压力P2通过导阀12控制，导阀12的控制口采用两个压力信号，两个压力信号采集供水和回水压力，保证进口压力P1和出口压力P2的衡定压力差，导阀的开度随两个信号的变化而变化。

The inlet pressure P1 enters the control chamber of the main valve through the pilot valve and needle valve, and establishes a downward pressure P3. The outlet pressure P2 is controlled by pilot valve 12, which uses two pressure signals to collect the supply and return water pressures, ensuring a constant pressure difference between inlet pressure P1 and outlet pressure P2. The opening of the pilot valve changes with the changes of the two signals.

全关闭状态：当主阀进口端水压分别进入阀体及控制室，且主阀的外部球阀同时关闭，此时主阀处于关闭状态。

Fully closed state: When the water pressure at the inlet end of the main valve enters the valve body and control room respectively, and the external ball valve of the main valve is closed at the same time, the main valve is in a fully closed state

全开启状态：当主阀外部的球阀全开后，此时控制室内水压全部释放到管路下游，而主阀也呈现为开启状态。

Fully open state: When the ball valve outside the main valve is fully open, all the water pressure in the control room is released to the downstream of the pipeline, and the main valve also shows a fully open state

浮动调节状态：调节主阀外部的球阀开度，使进水端流向控制室的水流和控制室流向下游的水流达到平衡，此时主阀处于调节浮动状态。

Floating adjustment state: Adjust the opening of the ball valve outside the main valve to balance the water flow from the inlet end to the control room and the water flow from the control room to the downstream. At this time, the main valve is in the floating adjustment state

流量示意图 Flow diagram

安装与调试 Installation and debugging

安装

1、装卸： 压差旁通阀要求小心装卸，建议用软的绳索起吊，以免损坏阀和配管，保护外装饰，阀门要求小心轻放地面，不能直接坠落地面；

2、检查：在搬运到目的地后，首先按说明书的内容检查确认，配管是否正确，连接是否可靠，运输过程中是否损坏阀门，各种零件是否完整；

3、安装前要求清理管道中的杂质，检查相应的法兰是否与阀门法兰的压力等级、公称通径一致，以保持管路的畅通；

4、在压差旁通阀前后，要求安装两只闸阀，以检测和维修使用；

5、压差旁通阀的感应压力管路要求直接连接在供水及回水管道上，以准确反映供水回水之间的压力差，为方便的安装使用，可在感应管路上安装球阀；

调试

1、先检查所有的闸阀、球阀、针阀是否完全打开。

2、观测供回水之间的压力，根据压差值调整压差导阀，拧开导阀上的顶帽，用活动扳手旋转顶部螺杆，从上往下看，顺时针旋转时压差增加，逆时针旋转时压差减少，根据所需的压差值进行旋转，当压差达到要求时，拧上顶帽，此时压差就会保证在设定的压差值，而不管管道的压力变化情况。

3、主阀的动作速度可由针阀进行调整，当顺时针旋转时动作减慢，当逆时针旋转时动作加快，正常情况下，主阀已设定妥当，而不需要进行调整。