Butterfly valve

Soft seal gate valve is divided into open stem soft seal gate valve and dark stem soft seal gate valve. There is usually a trapezoidal thread on the lifting rod, through the nut in the middle of the gate and the guide groove on the valve body, the rotation movement into a straight line, that is, the operating torque into the operating thrust. When the valve is opened, the flow path is completely clear when the lift height of the gate is equal to 1:1 of the valve size, but this position cannot be monitored during operation. In actual use, the valve stem is marked by the vertex, that is, the open position, as its full open position. In order to consider the temperature change lock phenomenon, usually in the open to the vertex position, and then back to 1/2-1 circle, as the full open valve position. Therefore, the full open position of the valve is determined by the position of the gate (i.e., travel >). Valves of this class shall generally be installed horizontally in piping.

Features:

1 flat seat

The traditional gate valve is often in the water wash pipe after the external objects such as stone, wood, cement, paper, debris and other silt deposited in the valve bottom groove, easy to cause can not close tight and form leakage phenomenon. The bottom of the soft seal gate valve adopts the same flat bottom design as the water pipe, which is not easy to cause debris deposition and make the fluid unimpeded.

2 whole package

The valve adopts high quality rubber for the whole inside and outside of the rubber, the domestic first-class rubber vulcanization technology makes the vulcanized valve can guarantee the precise geometry size, and the rubber and the nodular cast iron valve is next firm, not easy to fall off and good elastic memory.

3 corrosion

The valve body is coated with powder epoxy resin to prevent corrosion and rust of the valve body. And can be used in sewage systems. It is not easy to break traditional cast iron gate valves often break due to impact, collision or overlap. This situation has been greatly reduced by the use of ductile iron as the body.

4 three "O" type

The stem is designed with three "O" ring seals. Can reduce the friction resistance when the switch, greatly reduce the leakage phenomenon and can not stop water construction replacement seal ring.

It helps you drink it raw

The inside of the valve body is coated with non-toxic epoxy resin, and the inside and outside surfaces of the gate valve are completely covered with rubber without rust or corrosion.

6 precision cast body

The body is precision cast and the precise geometry allows the sealing of the valve without any finishing work to the north of the body.

7 light weight

The body is made of ductile ink, and the weight is about 20 to 30 percent less than the traditional gate valve weight, convenient maintenance.

USES:

Over the past 2010 years, the domestic many valve manufacturers developed soft-sealing gate valve, the valve and the traditional woven type or parallel type than double sluice gate valve has the following characteristics: 1, soft-sealing gate valve, valve body, valve cover by using precision casting foundry, a molding, mechanical processing, no longer do not use seal copper ring, save nonferrous metals; 2. There is no pit at the bottom of the gate valve with soft seal, no residue is accumulated, and the failure rate of gate valve opening and closing is low; 3, soft sealing lining valve plate size, interchangeability. Therefore, the soft seal gate valve will be the development direction of gate valve, but also a kind of valve that the water supply industry is willing to use. Soft seal gate valve, do not close dead, as long as the water effect can be achieved, otherwise it is not easy to open or lining rubber stripping. The butterfly valve used in the water supply industry is mostly soft sealing butterfly valve, in view of the butterfly valve in the installation process of the rubber ring vulnerable to damage affect the sealing, many manufacturers introduced metal sealing butterfly valve instead of rubber ring sealing butterfly valve. Metal sealing butterfly valve because of the small elasticity of seals, the general use of eccentric structure, especially with three-dimensional eccentric structure is more reasonable.

The valve has butterfly valve, gate valve, ball valve and plug valve and so on several kinds, in the water supply pipe network USES the scope is different. In order to reduce the overburden depth of pipeline, butterfly valve is selected for the pipeline with larger diameter. If it has little effect on the overburden depth, the gate valve should be selected; It is difficult to cast and process ball valve and cock valve. In recent years, due to the improvement of casting technology, resin sand casting method can avoid or reduce machining, thus reducing the cost, so the feasibility of ball valve used in large diameter pipeline is worth exploring. As to the demarcation line of aperture size, should each district considers to divide according to specific circumstance. The main disadvantage of butterfly valve is that the butterfly plate occupies a certain water cross section and increases a certain head loss. Although there is no such problem with gate valves, the height of large-diameter vertical gate valves affects the soil covering depth of pipelines, and the length of large-diameter horizontal gate valves increases the transverse area occupied by pipelines, affecting the arrangement of other pipelines. Ball valve and plug valve are maintained single gate valve, small water resistance, sealing reliable, flexible, easy operation and maintenance and other advantages. Plug valves have similar advantages except that the cross section is not perfectly round.

Requirements:

1. The manufacturing standard of soft seal gate valve shall indicate the national standard number according to. If the soft seal gate valve is the enterprise standard, the enterprise document shall be attached to the procurement contract.

2. The type of soft seal gate valve shall be marked with the national standard number requirements. If the enterprise standard, should indicate the relevant description of the model.

3. The specifications and categories of soft-seal gate valves shall meet the requirements of pipeline design documents.

4. The working pressure of the soft seal gate valve shall be greater than that of the pipeline. On the premise of not affecting the price, the allowable working pressure of the valve shall be greater than the actual working pressure of the pipeline; Any side of the soft seal gate valve should be able to withstand 1.1 times of the valve pressure without leakage under the closed condition; When the valve is open, the body should be able to withstand twice the working pressure of the valve.

Advantage:

For a long time in the market for the use of the general gate valve, there is widespread leakage, easy to rust, the enterprise introduced foreign advanced technology produced by the soft seal gate valve. Overcome the general gate valve sealing poor, elastic fatigue, easy to rust and other defects. Soft-sealing gate valve is the replacement of the traditional gate valve, the use of flexible disc produce trace deformation compensation effect, achieve good sealing effect, the valve has the switch light, reliable sealing, elastic memory and long service life etc, can be widely used in tap water, sewage, construction, food, electricity, medicine, metallurgy, textile, energy systems and other fluid on the pipeline as the adjusting and intercepting device is used.