ZHD氣動薄膜多級調節閥是一種新穎的壓力平衡套筒結構高壓差調節閥。閥內組件的套筒和閥芯是一種多孔和串級的混合結構，流體先經過套筒窗口進行①級節流，再經過三級連續串級節流，允許壓差大，密封性好，流體通道呈S流線型，流量大，調節閥動態穩定性好。電動多級節流閥是火力發電廠鍋爐給水系統的重要調節閥之一，也可適用于石油化工等其他工業的自動控制系統控制高壓差流體，可配電動執行機構和氣動執行機構。

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.

高壓差范圍內連續調節

Continuous regulation within the range of high pressure difference

采用多級節流介質逐漸減壓，每級壓降都在汽化壓力之上，抗汽蝕，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.

閥芯采用非平衡式結構，錐面密封，密封效果好。

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

套筒結構為多孔籠式，嚴格按所需調節特性排列，調節性能好。

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

閥芯上下均設有導向，調節平衡，無振動，自清能力強。

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

密封面堆焊硬質合金，閥芯(桿)表面噴涂硬質合金材料，耐沖蝕，壽命長。

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.

應用

application

鍋爐給水旁路作為啟動或低負荷運行時候給水調節。

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

給水再循環旁路調節(*小流量調節閥)。

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

高壓旁路噴水減溫，過熱器噴水減溫。

High pressure bypass spray desuperheating and Superheater spray desuperheating.

其他高壓差環境下介質調節。

Medium regulation in other high differential pressure environments.