Once the shutoff valve is in the open state, there is no more contact between its seat and the sealing surface of the disc, so its mechanical seal wear is less, because most of the seat and disc of the cutoff valve are easier to repair or replace. It is not necessary to remove the entire valve from the pipeline when sealing the components, which is suitable for the welding of valves and pipelines. The direction of flow of medium through such valves has changed, so the flow resistance of the shut-off valve is higher than other valves.
Commonly used stop valves are the following:
1) Angle-type shut-off valve; In the angle-type shut-off valve, the fluid only needs to change the direction once, so that the pressure drop through this valve is smaller than that of the conventional structure.
2) DC type stop valve; In the direct or Y type globe valve, the flow channel of the valve body is in a diagonal line with the main flow channel, so the damage degree of the flow state is smaller than the conventional stop valve, so the pressure loss through the valve is also corresponding. It's small.
3) Globe valve: This type of globe valve is a variant of a conventional globe valve. In this valve, the flap and seat are usually designed based on the plunger principle. The valve flap is ground to connect the plunger to the valve stem, and the seal is achieved by two elastic seals that are placed on the plunger. The two elastomeric seals are separated by a collar and the seal around the plunger is secured by the load applied by the bonnet nut to the valve cap. Elastic seals can be replaced and can be made from a wide variety of materials. The valve is mainly used for "open" or "closed", but it is available with a special plunger or special collar, which can also be used to regulate the flow .
Globe valves have the following advantages:
1, simple structure, manufacturing and maintenance more convenient.
2, the work schedule is small, opening and closing time is short.
3, good sealing, low friction between the sealing surface, long life.
4. The valve body has a straight-through, direct-flow, and right-angled structure. Straight through is the most common structure, but its fluid resistance is greatest. The DC type fluid has small resistance, and it is mostly used for fluids containing solid particles or with high viscosity. The right-angle valve body is mostly forged and is suitable for smaller pass-by valves and higher pressure shut-off valves.
The disadvantages of the globe valve are as follows:
1. The fluid resistance is large, and the force required when opening and closing is large.
2, does not apply to particles, viscosity, easy to coke the medium.
3, poor regulation performance.
4. The type of globe valve is divided into male thread type and female thread type according to the position of the stem thread. According to the flow direction of the media, there are straight-through, direct-flow, and angled. The shut-off valve is divided according to the form of the seal. There are packing seal cut-off valve and bellows sealed shut-off valve.
5. Bellows sealed globe valve adopts the design of bellows seal, which completely eliminates the shortcomings of the quick and easy leakage of common valve stem packing seals. It not only improves the use of energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequent Maintenance, but also provides a clean and safe working environment.
Screen Pipe
Screen pipe is a new type of corrugated plastic pipe with corrugated appearance formed by high density polypropylene (PPR) with other additives. The permeable corrugated pipe is formed by drilling holes in the grooves and processing polyester spun-bonded nonwoven geotextiles around the pipe.Widely usedin highway, railway subgrade, subway, soft foundation treatment engineering, waste landfill site, tunnel, greenbelt, sports field and slope protection caused by high water content, as well as agricultural and horticultural underground irrigation and drainage system.
application
1.Vertical and horizontal drainage and water transmission of expressway;
2. Vertical and horizontal drainage on the back of various retaining walls and side trenches of the expressway;
3. Drainage of tunnels and underground tunnels;
4. Municipal engineering, water purification plants, sewage plants, garbage dumps, etc.
5. Drainage of leisure green Spaces such as golf courses, sports fields and parks;
6. Soil and water conservation of slope development;
7. Underground drainage of land works;
8. Ultra-soft foundation treatment project.
advantage
1. High safety of drainage, and the orifice is not easily blocked, which ensures unimpeded water transmission system.
2. Compared with the soft spring drain pipe, the plastic is not easy to rust.
3. Organic combination of strength and flexibility
4. Compared with other drainage pipes of the same caliber, the price is lower.
Packaging Details
Plastic caps on both ends, Steel bundle, Woven bag or acc. to customers' request.
Delivery Time
15 days after receiving deposit
If you have any questions, please contact with us directly and welcome you can visit our Factory.
Screen Pipe
Pipe Screens,Oil Screen Pipe,Slotted Screen Pipe,Fock Oil Composite Sand Screen
HEBEI CHENGYUAN PIPE INDUSTRY GROUP CO.,LTD , https://www.hbcytube.com