Anticorrosive method of needle valve

First the body of the anti-corrosion, the main choice of materials for stainless steel, carbon steel. Corrosion is very rich, but can choose properly, or not easy, because the corrosion problem is very complex. Select Instrument needle valve material difficulty, lies not only consider the corrosion problem, and must consider the ability to withstand temperature, whether it is economically reasonable, is it easy to buy and other factors.
Second is to take the lining measures, such as lining of lead, aluminum lining, plastic lining, lining of natural rubber and synthetic rubber. If the medium conditions permit, this is an economical method.
Again, the pressure, temperature is not high case, the main Needle valve to do with non-metallic materials, can often be very effective to control corrosion.
In addition, the outer surface of needle valve body is also subject to corrosion, general steel materials to paint protection.

Needle valve

Is a fine needle Instrument valve , the valve plug into a needle shape, mainly for regulating the flow of solar term. Fine adjustment Instrumentation ball valves required valve port opens gradually become larger, maximum energy from the closed to open continuously adjusts. Needle valve plug that is able to achieve this function. Needle valve plug generally hardened steel with a long needle, while the seat is made of tin, copper and other soft materials. Valve needle and valve seat seal between the conical surface is depend on the close coordination to achieve. Taper needle valve 60 with 1:50 and two kinds of cone angle, cone surface after fine grinding. Stem and the valve seat seal between is to achieve by the bellows.

Processing Considerations high pressure pipe fittings

Wenzhou high-pressure pipe parts replaced by normalizing annealing process is more economical. Let's say for processing Notes on stainless steel elbow, stainless steel elbow made of stainless steel, it is the most representative of the characteristics that is does not rust. No rust is closely related to the operation time, the time change will occur in different colors. Change the order of the color is brown, gold, red, purple and green. The process is especially a big galvanized elbow connection.
Wenzhou Banda Tube Manufacturing Co. production of tees, reducers, high-pressure pipe is generally used in the steam pipe branch at the trunk, to provide users with the necessary heat source means more nodes in the process, our products have unique technology processing experience, can provide the best advice to users, under normal circumstances, in the three-way or four-way point, set a fixed point, in order to ensure the stability of the pipeline, the other in a natural setting on the branch line to reduce the compensation of trunk Thrust. (FD-LOK Metal Gasket Face Seal Fitting) means a pipe with elbow (flange or access disk). It may be cast from (Figure Reserved), but also by screwing or welding composition.
Two sealing surface of the bolt flange gasket pressed against each other and form a seal, but it also led to the destruction sealed. To maintain the seal, sometimes you have to maintain a huge rally to make welded joints, shock, bending tests. The test was completed by the test plate. The test plates with the best seam welded together into a cylindrical vertical, in order to ensure quality, high efficiency, low labor intensity characteristics.

Stainless steel tube pipe market heating up prospects

Led the development of technology to improve people's living standards, self-health awareness has increased a lot. In daily life, the use of "safe" and "healthy" products are the most modern topic of concern. The pursuit of health and lifestyle of modern people more and more use of stainless steel pipe fittings, polyethylene and other green pipe.
Drinking water quality and water is one of the people most concerned about the topic.  FD-LOK 37° flared tube fittings is generally easy to rust, corrode, leak, easy to scale, and so fatal weakness. Therefore, the stainless steel dry pipe does not rust, no corrosion, no leakage, no scaling features to get people of all ages about. Some developed countries also have developed legislation prohibiting the use of galvanized steel pipe used as a drinking water conveyance.
Fashion green pipe stainless steel pipe and other sales activity, sales booming, some products also appeared in short supply, has become a new growth point of national economy. Market survey, FD-LOK stainless steel tube fittings is the fastest growth in 2002 and 2003 production, and extraction that is expected to exceed the amount of 3.5 million tons or more.

Stainless steel pipe fittings during the winter rainy period Notes

In the current building are often used FD-LOK socket weld fittings, such as clamps, elbows, etc. are commonly used, these are of FD-LOK o ring face seal fitting outdoors when not know if you have had time to consider outdoor stainless steel pipe fittings Construction of rain What issues should pay attention to.
Normally outdoor water supply FD-LOK flared tubing fittings Construction in the rain, especially in the basement should be dug drain gutter, sump, ready pumps, hose and other pumping equipment for pumping, to prevent rainwater soak idler avoid drift tube accidents, construction After completion shall promptly backfill. Then how to deal with it in the special period? Like the rain in the winter period, when more should pay attention to:
(1) Asbestos cement interface hot water mixing materials should be used, but the water temperature should not exceed 500C, such as expanded when cement interface and the water temperature should not exceed 350C;
(2) when the temperature is below -50C, not suitable for the above two material interfaces,
(3) the interface is completed, can brine mixing slime seal conservation, and good cover straws son. Soil can also be warm (not frozen soil) landfill interface insulation;
(4) pressure test, should be exposed pipe or interface with a straw mat Gaiyan no interface tube body should backfill pressure test is completed as soon as the water put the net, do the preparatory work before the pressure test and pressure test After drainage, drainage and other work.

Stainless steel pipe installation techniques are the following nine considerations:

1, FD-LOK stainless steel tube weld fittings, not in direct contact with other metals, wood or rubber should be padded panels and other non-metallic materials.
2, pipe cutting allowed to use ordinary grinding wheel cutting, should be made of stainless steel special grinding wheel or plasma cutting.
3, the inner side of the weld should be filled with argon protection stainless steel pipe and tube tack welding.
4, arc and ending arc, arc welding method using back, crater should be filled crater. Arcing must be completed within the groove, is prohibited in pipes, fittings base metal surface arcing and arcing. If the arcing found at the crater holes, cracks and other defects should be promptly dealt clean.
5, stainless steel pipes, pipe fittings and FD-LOK stainless steel fittings, pipe fittings to connect with non-stainless steel pipes, pipe fittings, welded butt joint backing tube and the cavity should be filled with argon, in order to carry out TIG welding before.
6, multi-channel multi-arc welding, the arc of the income should be staggered.
7, stainless steel continuous welding, interlayer temperature does not exceed 60 ℃.
8, pipeline welds at weld after welding to pickling and passivation.
9, FD-LOK Stainless steel pipe fitting hydrostatic test water temperature and water quality have certain requirements, which shall not be less than 5 ° C water temperature; chloride ion content in water shall not be greater than 25Pmm.