ZHD气动薄膜多级调节阀是一种新颖的压力平衡套筒结构高压差调节阀。阀内组件的套筒和阀芯是一种多孔和串级的混合结构，流体先经过套筒窗口进行①级节流，再经过三级连续串级节流，允许压差大，密封性好，流体通道呈S流线型，流量大，调节阀动态稳定性好。电动多级节流阀是火力发电厂锅炉给水系统的重要调节阀之一，也可适用于石油化工等其他工业的自动控制系统控制高压差流体，可配电动执行机构和气动执行机构。

Zhd pneumatic diaphragm multi-stage regulating valve is a novel high-pressure differential regulating valve with pressure balance sleeve structure. The sleeve and valve core of the components in the valve are a mixed structure of porous and cascade. The fluid first passes through the sleeve window for ① stage throttling, and then passes through three-stage continuous cascade throttling. The allowable differential pressure is large, the sealing is good, the fluid channel is s-streamlined, the flow is large, and the dynamic stability of the regulating valve is good. Electric multi-stage throttle valve is one of the important regulating valves in boiler feed water system of thermal power plant. It can also be used in automatic control systems of petrochemical and other industries to control high-pressure differential fluid. It can be equipped with electric actuator and pneumatic actuator.

高压差范围内连续调节

Continuous regulation within the range of high pressure difference

采用多级节流介质逐渐减压，每级压降都在汽化压力之上，抗汽蚀，噪音低。

Multistage throttling medium is used to gradually reduce the pressure, and the pressure drop of each stage is above the vaporization pressure, with anti cavitation and low noise.

阀芯采用非平衡式结构，锥面密封，密封效果好。

The valve core adopts non-equilibrium structure and conical sealing, with good sealing effect.

套筒结构为多孔笼式，严格按所需调节特性排列，调节性能好。

The sleeve structure is porous cage type, which is arranged strictly according to the required adjustment characteristics, with good adjustment performance.

阀芯上下均设有导向，调节平衡，无振动，自清能力强。

The valve core is provided with guidance at the top and bottom, adjusting balance, no vibration and strong self-cleaning ability.

密封面堆焊硬质合金，阀芯(杆)表面喷涂硬质合金材料，耐冲蚀，寿命长。

The sealing surface is overlaid with cemented carbide, and the surface of valve core (rod) is sprayed with cemented carbide, which is erosion resistant and long service life.

应用

application

锅炉给水旁路作为启动或低负荷运行时候给水调节。

Boiler feedwater bypass is used as feedwater regulation during startup or low load operation.

给水再循环旁路调节(*小流量调节阀)。

Feedwater recirculation bypass regulation (* small flow regulating valve).

高压旁路喷水减温，过热器喷水减温。

High pressure bypass spray desuperheating and Superheater spray desuperheating.

其他高压差环境下介质调节。

Medium regulation in other high differential pressure environments.