Advantages and disadvantages of forged steel flanged gate valves

Advantages and disadvantages of forged steel flanged gate valves - section two

Installation and maintenance of gate valves should be noted as follows:
I. Handwheel handle and drive mechanism are not allowed for lifting, and collision is strictly prohibited.
II. Double disc gate valves should be installed vertically (that is, the stem is in a vertical position and the handwheel is at the top).
III. Gate valves with a bypass valve should be opened before opening (to balance the pressure difference between the inlet and the outlet and reduce opening force)
IV. Gate valves with drive mechanism shall be installed according to the product operating instructions
V. Lubricate the valve at least once a month if it is always on and off.
Structural features:
On the market, using a common general valve for a long time can cause leakage or rusty phenomenon. Our company introduced the European high-tech rubber seal of the elastic base seat and valve manufacturing technology of gate valves, overcoming the general bad gate seal, rust and other defects. Seal gate valves of the elastic base seat using elastic disc produce elastic deformation compensation effect to achieve good sealing effect. This valve has the switching, reliable sealing elastic memory, long service life and other significant advantages, which can be widely used in fields such as tap water, sewage, construction, oil, chemical, food, medicine, textile, power, shipping, metallurgical and energy system, commonly used as adjustment and closure device.

Features of forged steel flanged gate valves:
Light weight: the body is made of advanced nodular black cast iron. The weight is 20%~30% less than that of traditional gate valves.
Flat type brake block: traditional gate valves often deposit external objects such as stones, wood cement, and iron debris sedimentation in the water at the bottom of the valve after flushing the pipe. For example, the slots cause the valve cannot be closed tightly and form slack phenomenon. For the gate valves, the bottom of the seal for elastic base seat is designed with a flat water pipe, which is not easy to cause debris deposition, so that the water flow is unimpeded.
Integral rubber packing: the gate is made of high quality rubber and integrated with rubber inside and outside. The European first-class rubber vulcanization technology enables the gate after vulcanization to guarantee the accurate geometry size, and the rubber and the ball ink-cast gate are firmly followed, which is not easy to fall off and has good elastic memory. Recessed body: the valve body is accurately cast, and the precise geometry guarantees the sealing of the valve without any finishing.

Forged steel flanged gate valves have the following advantages:
I. The fluid resistance is low, and the sealing surface is subjected to the medium attack and erosion.
II. It takes less effort to open and close.
III. The flow direction of medium is free from restriction, disturbance and pressure reduction.
IV. Simple shape, short structure length, good manufacturing technology and wide application range. 

Defects of forged steel flanged gate valves are as follows:
I. The sealing surface is easy to cause erosion and abrasion, and maintenance is difficult.
II. The size is large, so it needs some space to open and close for a long time.
III. Complex structure.

Installation and use of forged steel flanged gate valves
I. Before installation, check the valve chamber and sealing surface, and do not allow dirt or sand to adhere.
II. Bolts at all connection parts shall be tightened evenly.
III. Check packing position for compaction to ensure packing seal and gate opening.
IV. Before installing the valve, the user must check the valve model, desirable size and pay attention to the flow direction of the medium to ensure consistency with the requirements of the valve.
V. When installing the valve, the user must reserve the necessary space to drive the valve.
VI. The connection of the driving device shall be made according to the circuit diagram.
VII. Gate valves must be maintained regularly and should not be bumped or squeezed at will to avoid affecting the sealing performance.

Advantages and disadvantages of forged steel flanged gate valves - section two