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Gate valve

key word:Heat exchange element


Product description

Gate valve

 

1. Introduction

1.1. Purpose

The gate valve and the electric gate valve are installed on the water and steam pipelines as the opening and closing devices. When the valve is in use, it should be fully opened or closed, and can not be used as a regulating valve.

1.2. Structural features

1.2.1. The gate valve and electric gate valve adopt pressure self tightening sealing structure or middle flange sealing structure. The sealing pair is divided into three forms: double gate, elastic single gate and rigid single gate. The two ends and pipeline are connected by welding or flange.

1.2.2. The closing mechanism of double gate valve is mainly composed of self-aligning wedge-shaped double gate valve, universal top valve and clamp ring, which makes up and down movement under the guidance of guide rib in valve body; single gate valve makes up and down movement under the guidance of guide rib in valve body.

1.2.3. The valve seat is inlaid and welded on the valve body, and its sealing surface and disc sealing surface are made of cobalt based cemented carbide spray welding or surfacing, with high hardness, wear resistance, abrasion resistance and long service life.

The valve rod is made of high hardness and abrasion resistance after nitriding. The service life of the valve rod is 1.4

1.2.5. The pressure self tightening sealing mechanism uses the medium pressure to compress the wedge seal ring to realize the sealing. The higher the medium pressure is, the better the sealing performance is.

1.2.6. The opening and closing of the valve is controlled by the electric device installed on the valve cover. The electric device is equipped with valve motor, reducer, torque control mechanism, field operation mechanism, stroke control mechanism, hand and electric switching mechanism.

1.2.7. The opening and closing of the valve are adjusted by the stroke control mechanism. Adjusting the torque limiting mechanism can protect the valve when the stroke mechanism fails

1.2.8. The valve can be manually and electrically switched. The power supply will be automatically cut off when the valve is manually operated, and the valve will be closed when the hand wheel rotates clockwise. If equipped with flashing indicator, the operator can know the situation of the valve at any time.

1.2.9. The valve can be equipped with various electric devices.

 

2. Main technical parameters (see table 41-1)

Table 41-1 main technical parameters of gate valve

Item Parameter
Nominal (working) pressure rangeMPa PN10PN32(class300class4500)
Operating temperature range(℃) 200610(3921130)
Nominal size range (mm) DN40DN450(418in)
Connection mode Flange or welding
Valve body material WCB, WCC, C12A, WC9, WC6, ZG20CrMoV, CF8, 25, SA105, 12Cr1Mo1V, F91, F22, F304, F316, F21