自动差压控制阀
ZY47系列自调压阀是一个不依赖外部电源来保持恒压的控制
系统平衡阀的液压状态，副供水（G）和回风式（H）二，在城市供暖（空调），水系统，维护受控系统（区，建筑物，单机，用户，设备......）差压设定值，特别是自动调节，车厢温度控制，家用计量系统的可变流量。
特征
双阀结构的阀杆不平衡力小，结构紧凑，用于加热水系统（空调），受控系统的恒定压差，具有以下特点：
1，充电系统压力恒定;
2，支持系统内自动调节;排除外部网络控制系统的差压波动;
3，采用先进的隔膜技术，理论误差为零，可承受0.8MPa的压差;
4，采用先进的无级调压结构，可调控压差比可达25：1;
技术参数
1，公称压力1.6MPa（2.5MPa计划）;
2，中温0〜120℃; g; C;g; C;
3，工作压力范围0.04〜0.4MPa;
4，结构长度符合GB / T12221优选尺寸结构的截止阀和止回阀的结构。
5，法兰尺寸符合GB4216-84灰铸铁法兰尺寸。

Self-operate differential pressure control valve
ZY47 Series Self pressure control valve is a do not rely on external power to maintain the constant pressure of the control
system balancing valves of the hydraulic condition, the sub-water supply (G) and the return type (H) two, with in the urban heating (air conditioning), water systems,maintaining the controlled system (a district, a building, a single unit, a user, a device ......) differential pressure setpoint, especially the self-regulating, compartment temperature control, variable flow rate of household metering system.
Features
Dual valve structure of the valve stem unbalanced force is small, compact structure, used for heating water systems (air conditioning), a constant differential pressure of the controlled system, and has the following features:
1, charged with a constant system pressure;
2, support charged within the system self-regulating; rule out the differential pressure fluctuations in the external network controlled system;
3, the use of advanced technology diaphragm, the theoretical error is zero, and can withstand 0.8MPa pressure differential;
4, the use of advanced stepless voltage regulation structure, adjustable control differential pressure ratio up to 25:1;
Technical parameters
1, nominal pressure of 1.6MPa (2.5 MPa scheduled);
2, medium temperature 0 ~ 120 ° C;g; C;g; C;
3, the working pressure range 0.04 to 0.4 MPa;
4, the length of the structure in line with the preferred size GB/T12221 the length of the structure of the 'cut-off valve and check valve.valve.
5, flange dimensions conform to the GB4216-84 in gray cast iron flange dimensions.