产品描述 Product Description

进口缓闭止回阀、逆止阀具有结构新颖、设计合理、密封性能好、流动阻力小、流量大和使用寿命长等特点。由于在主阀上配装了外接导管控制系统，利用水力自动操作，可使主阀获得最佳的开启或关闭速度，从而防止了水锤及水击现象的产生，达到缓闭消声的效果，是高层建筑给供水系统的理想产品。

Imported slow closing check valves and check valves have the characteristics of novel structure, reasonable design, good sealing performance, low flow resistance, large flow rate, and long service life. Due to the installation of an external conduit control system on the main valve and the use of hydraulic automatic operation, the main valve can achieve the optimal opening or closing speed, thereby preventing the occurrence of water hammer and water hammer, achieving the effect of slow closing and noise reduction. It is an ideal product for high-rise building water supply systems.

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

缓闭止回阀、逆止阀分两种型式：隔膜型与活塞型。结构由主阀、单向阀、针阀、球阀和压力表等组成。由于导阀、针阀和压力表等是用外接导管与主阀相连接，所以统称为导管控制系统，如下图所示

There are two types of slow closing check valves and check valves: diaphragm type and piston type. The structure consists of a main valve, a one-way valve, a needle valve, a ball valve, and a pressure gauge. Due to the fact that the pilot valve, needle valve, and pressure gauge are connected to the main valve through external conduits, they are collectively referred to as conduit control systems, as shown in the following figure

主要零件材质 Main component materials

工作原理 working principle

当水泵开始工作时，给水从阀门的进水端进入，通过过滤器5、针阀8、单向阀9 的水进入阀盖控制室，再经球阀排泄到下游。由于针阀8开度小，（一般打开1/4圈即可），所以控制室内的排泄速度大于入口补水速度，造成控制室内的压力减少，一直作用在主阀瓣下面的入口压力将主阀瓣托起，从而打开主阀瓣向下游供水。当管道停止给水时，下游的水开始往回流。由于单向阀的作用，一部份回流的水由球阀进入阀盖控制室后不能流出，因此控制腔的压力逐渐增大，阀杆缓慢下移，最后使主阀瓣严密关闭，防止了下游的水回流，并起到了缓闭消声的作用。

When the water pump starts working, the feed water enters from the inlet end of the valve, enters the valve cover control room through filter 5, needle valve 8, and one-way valve 9, and is then discharged downstream through the ball valve. Due to the small opening of needle valve 8 (usually 1/4 turn), the discharge velocity in the control room is greater than the inlet water replenishment velocity, resulting in a decrease in pressure in the control room. The inlet pressure that has been acting below the main valve disc lifts the main valve disc, thereby opening the main valve disc to supply water downstream. When the pipeline stops supplying water, downstream water begins to flow back. Due to the function of the one-way valve, a portion of the returned water cannot flow out after entering the valve cover control room through the ball valve. Therefore, the pressure in the control chamber gradually increases, and the valve stem slowly moves downwards. Finally, the main valve disc is tightly closed, preventing downstream water backflow and playing a role in slow closing and noise reduction.

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

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、主阀最佳安装方式是水平安装在管线上，阀盖朝上，其它安装方式也可达到使用功能。

2、安装前要清除道内的杂物，冲洗管道，安装时要注意主阀体外水流标示箭头，遵循方向安装。

3、主阀前需安装一只闸阀和一只过滤器，主阀后也需装一只间阀，以便干维修。

4、试水时要慢慢开启主阀前的间阀，慢慢增加压力，同时注意阀体外的控制管路是否泄漏。

5、主阀导管进口处的过滤器要求2~3个月清洗一次。

调试

1、检查安装是否正确。

2、打开球阀、针阀。注：针阀开启1/2，球阀全开。

3、开泵达到设定压力在停泵此时逆止阀关闭。

4、关闭如有很大的水锤，此时需根据实际情况关小球阀使关闭时间延长消除水锤。

5、如开启过慢，此时可根据实际情况关小针阀，开大球阀。