The opening and closing component of Z45X national standard concealed rod soft seal gate valve is the gate, and the movement direction of the gate is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve has two sealing surfaces, and the two sealing surfaces of the commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50 degrees, and 2 ° 52 degrees when the medium temperature is not high. The gate of a wedge gate valve can be made as a whole, called a rigid gate; It can also be made into a gate that can produce slight deformation to change its processability and compensate for the deviation of the sealing surface angle during the processing. This type of gate is called an elastic gate.

The Z45X national standard concealed rod soft seal gate valve not only has the advantages of elastic seat seal gate valve, but also has reliable opening and closing, so it is often used in fire protection and industrial systems, and is generally installed at a higher position above the ground.

The Z45X national standard concealed rod soft seal gate valve usually has trapezoidal threads on the lifting rod. Through the nut on the valve and the guide groove on the valve body, the rotational motion is converted into linear motion, that is, the operating torque is converted into operating thrust. When the valve is opened, when the lifting height of the gate is equal to 1:1 times the valve diameter, the fluid channel flows, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a marker, that is, the position where it cannot be opened, as its fully open position. To consider the phenomenon of locking due to temperature changes, it is usually done by opening the valve to the top position and then reversing it by 1/2-1 turn as the position for fully opening the valve. Therefore, the fully open position of the valve is determined by the position (i.e. stroke) of the gate.

Characteristics of Z45X national standard concealed rod soft seal gate valve:

1. The valve body material should mainly be cast iron, cast steel, stainless steel, 316L, and the grade and actual physical and chemical testing data of the cast iron should be indicated.

2. The valve stem material should strive for stainless steel stem (2CR13), and large-diameter valves should also have stainless steel embedded stem.

3. The nut material is made of cast aluminum brass or cast aluminum bronze, and its hardness and strength are greater than those of the valve stem.

4. The material of the valve stem liner should have a hardness and strength not greater than that of the valve stem, and should not form electrochemical corrosion with the valve stem and valve body when immersed in water.

5. Material of sealing surface.

6. Integral encapsulation: The valve adopts integral encapsulation, which has good coverage and accurate geometric dimensions, reliable sealing, and long service life.

7. Lightweight: The valve is made of ductile iron, which is lightweight and easy to install.

8. Flat bottomed valve seat: The bottom adopts the same flat bottomed valve seat design as the water pipe, which is not prone to debris accumulation and provides reliable sealing.

9. The inner cavity is coated with epoxy resin to prevent corrosion and rust. It can not only be used for drinking, but also for sewage systems.

10. O-ring seal: The valve stem is sealed with three O-ring seals, which have low friction resistance, light opening and closing, and no water leakage.

Technical parameters of Z45X national standard concealed rod soft seal gate valve:

Nominal diameter: DN40-DN400

Pressure rating: 1.0MPa, 1.6MPa, 2.5MPa

Valve body withstand pressure of 1.5MPa, 2.4MPa, 3.75MPa

Sealing test at 1.1MPa, 1.76MPa, 2.75MPa

Working temperature: 0-80 ℃

Applicable media include water, oil, steam, etc.