Non-rising Stem Type Gate Valve

Professional gate valve manufacturer dark stem gate valve is also called rotary stem gate valve (also called dark stem wedge gate valve). Valve stem nut is located in the gate, the handwheel rotation drives the valve stem rotation, and make the gate lift, usually in the bottom end of the valve stem has trapezoidal threads, through the bottom end of the valve threads as well as the valve valve flap on the guide groove, the rotary motion into a straight line, that is, the operating torque into the operation of the thrust. When the valve is opened, the passage of fluid is completely free when the height of the gate lift is equal to 1:1 times of the through diameter of the valve, but this position cannot be monitored during operation.

The opening and closing parts of the dark stem gate valve is the gate, the movement direction of the gate is perpendicular to the direction of the fluid, the gate valve can only be fully open and fully closed, can not be used for regulation and throttling. Gate has two sealing surfaces, Z commonly used mode gate valve two sealing surfaces to form a wedge, wedge angle with the valve parameters, usually 50. wedge gate valve gate can be made into a whole, called rigid gate; can also be made to produce a small amount of deformation of the gate in order to improve its craftsmanship, to make up for the angle of the sealing surface of the bias in the processing process, this gate is called the elasticity of gate.

Stainless steel dark stem gate valve accessories main material:

The main materials of the valve body: ductile cast iron, cast steel, stainless steel, 316L is the main, and indicate the brand and the actual physical and chemical testing data of cast iron.

Stem material: strive for stainless steel stem (2CR13), large diameter valves should also be stainless steel embedded stem.

Nut material: cast aluminum brass or cast aluminum bronze, and the hardness and strength are greater than the stem.

Stem bushing material: its hardness and strength should not be greater than the valve stem, and in the water immersion condition and the valve stem, the valve body does not form electrochemical corrosion.

Technical parameters

First, Z45H dark stem cast steel gate valve introduction:

Z45H dark stem cast steel gate valve is a shield production products, instead of traditional cast iron valves, compact structure, reasonable design, dark stem cast steel gate valve rigidity, smooth channel flow, flow resistance coefficient is small; sealing surface of stainless steel and hard alloy, long service life; dark stem cast steel gate valve with flexible graphite packing, sealing, reliable, lightweight and flexible operation. Driven by manual, electric, pneumatic, gear drive; structure: flexible wedge single gate, rigid wedge single gate and double gate type. Dark rod cast steel gate valve is widely used in petrochemical, metallurgy, water treatment, thermal power plants and other oil, water vapor pipeline for connecting or disconnecting the pipeline medium opening and closing devices.

Second, Z45H dark rod cast steel gate valve parts materials:

Third, Z45H concealed rod cast steel gate valve external dimensions:

Fourth, Z45H concealed rod cast steel gate valve features and uses:

1. Compact structure. Reasonable design, good rigidity of the valve, smooth channel, flow resistance coefficient is small.

2. The sealing surface is made of stainless steel and hard alloy, with long service life.

3. The use of flexible graphite packing. Reliable sealing. The operation is light and flexible.

4. Driving form: manual, electric, gear drive.

5. Structure: flexible wedge-type single gate, rigid wedge-type single gate and double gate type.

6. Widely used in petrochemical, thermal power plants and other oil, water vapor pipeline for connecting or cutting off the pipeline medium opening and closing devices

Five, Z45H dark rod cast steel gate valve installation instructions:

(1), the handwheel, handle and transmission mechanism are not allowed for lifting, and prohibited collision.

(2), double gate gate valve should be installed vertically that is, the valve stem is in a vertical position, the handwheel at the top.

(3) The gate valve with bypass valve should be opened before opening to balance the pressure difference between the inlet and outlet and reduce the opening force.

(4) The gate valve with transmission mechanism should be installed according to the provisions of the product instruction manual.

(5), if the valve is often used on and off, lubricated at least once a month.