产品描述 Product Description

限流止回阀主要用于多泵并联采用改变台数的方式进行流量调节的系统中，安装在水泵的出口，依据水泵的设计工况扬程，导阀自动检测并控制水泵的实际工作扬程，以限制水泵的工作流量，限制电机的负载

The flow limiting check valve is mainly used in systems where multiple pumps are connected in parallel and flow is adjusted by changing the number of units. It is installed at the outlet of the water pump, and the guide valve automatically detects and controls the actual working head of the water pump based on the design working head of the water pump, in order to limit the working flow of the water pump and limit the load of the motor

功能和作用：

1.限流功能：安装于水泵出口，在单泵启动和非全数设计工作时，多工作泵起限制流量作用 Flow limiting function: installed at the outlet of the water pump, multiple working pumps have a flow limiting effect during single pump startup and non full design operation

2.泵在较高效率状态下工作：防止电动机受水泵低扬程、大流量、低效率时，发生过载现象 The pump operates at a higher efficiency state: to prevent overloading of the motor due to low head, high flow rate, and low efficiency of the water pump

3.防止超额定电流烧电机现象的发生，同时起到一定的节能效果 Prevent the occurrence of over rated current burning the motor, while also achieving certain energy-saving effects

4.止回功能，该阀的止回功能完全等同于微阻缓闭止回阀，且无关闭噪音，零回流。此阀主要用于多泵并联使用时安装与水泵压出口，起限制水泵工作流量，防止停泵回流作用 Check function, the check function of this valve is completely equivalent to a micro resistance slow closing check valve, and there is no closing noise and zero reflux. This valve is mainly used for installing and connecting to the water pump pressure outlet when multiple pumps are used in parallel, which limits the working flow of the water pump and prevents backflow when the pump is stopped

5.限制扬程可调范围0.1-0.6 Mpa，出厂时设定在0.1 Mpa  The adjustable range of the limit head is 0.1-0.6 Mpa, set at 0.1 Mpa at the factory

6.介质温度：0-100℃；

7.规格尺寸：DN32-1400

8.公称压力：PN10-25

9.适用介质：水、油品

10.设计与应用标准：GB、BS、ANSI、JIS、DIN、API

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

工作原理 working principle

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

安装示意图Installation diagram