Bangdong Advice : Pipe fitting classification and purchase precautions

First, the classification of pipe fittings

1, connector class

Rigid joint flexible joint flexible joint inner wire joint outer wire joint inner and outer wire joint monofilament joint double wire joint thread joint flat travel Ren Yangsi tour Yin silk tour internal and external teeth travel instrument joint valve joint pressure gauge joint gas meter Joint pipe joints ferrule joints flare joints welded joints socket joints quick joints pneumatic quick joints hydraulic quick joints reducer joints reduce straight pipe dampers edge joints reducers side joints direct head flange joints tube bundle live Connector Half pipe joint Rotary joint Purge joint Pipe repairer Compensator Huff section Opening joint Smooth joint Joint joint Anti-theft joint Flexible rubber joint Heat exchanger joint Force joint Saddle joint clamp Hose joint Green joint Outer joint Sanitary joint

2, elbow

Grooved elbow ferrule type elbow butt weld elbow socket elbow can flex rubber elbow inner teeth elbow outer teeth elbow inner and outer teeth elbow with elbow with seat elbow different diameter elbow seamless Elbow flange elbow double bearing elbow sanitary grade elbow 45° elbow 90° elbow 180° elbow

3, three-way class

Orthogonal three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way three-way four-way Three-way threaded three-way external teeth three-way silencer three-way water three-way belt three-way forged three-way seamless three-way sanitary three-way

4, four-way class

Positive four-way oblique four-way mechanical four-way equal diameter four-way four-way four-way flat four-way four-way groove four-way butt welding four-way thread four-way socket four-way seamless four-way health level four-way

5, reducer tube

Concentric reducer eccentric reducer reducer groove groove reducer sanitary grade reducer weld reducer pipe screw bundle thread reducer outer screw bundle section high pressure reducer pipe double bearing reducer

6, flange class

Grooved Flange Flat Flange Flange Flat Flange Butt Flange High Diameter Flange Flange Blind Flange Flange Flange Socket Flange Sanitary Flange

7, curved pipe

Bent pipe over bridge elbow pressure gauge elbow sharp bend elbow U-bend S-bend

8, caps

Caps Hexagon Caps Round Caps Threaded Caps Butt Welding Caps Heads Round Heads Elliptical Heads Cone Heads No Straight Head Plugs Plugs Quick Plugs Covers Covers Blind Ends

9, pipe fittings

Hexagon Bu Shen repair rod tube card water separator tube seat

Second, several issues need to be paid attention to when purchasing pipe fittings

Material problem

Many companies use more irregular materials, usually referred to as nickel content. Although it can be distinguished by syrup, it is obviously a misunderstanding, because the small charge contains only more than seven nickels that cannot be distinguished. However, the price difference of raw materials is very large, and this is one of the fakes. In particular, 321 high nickel and 316 high nickel are very serious.

2. Size problem

Many customers have basically no technical support for testing. For example, the 90 degree elbow, the conventional is R = 1.5D, but in general, the Wenzhou market basically produces molds of 1.25D, don't write the weight of the material inside the 0.25D~~ is very different. It is also the so-called factory standard, much shorter than the standard.

3. Thickness problem

Of course, the current customers are very smart, they will use calipers to measure the thickness, although sometimes the customer feels barely up to the standard, but ignores the point that the thickness of the back arc is not enough!!! Because there will be a wall reduction during the elbow pushing process Therefore, the caliber is barely up to standard, and the back is basically unqualified. Generally speaking, the experts know that the 114X3.5 elbow will use 114X4 thick pipes to produce. If the manufacturer purchases a little thinner, the natural loss will be reduced a lot, but the product will become the above-mentioned illusory, the surface is up to standard.

4. Solution treatment and non-destructive testing of sandblasting and sandblasting

Many manufacturers in the market do not do solution treatment and 100% penetration non-destructive testing, and many of them use sandblasting instead of rolling sand. After eliminating these steps, the cost is greatly reduced.

5. Welding seamless

Seamless welding is the elbow of welding. After sanding and grinding, there is no sign of welding on the surface. Even with advanced flaw detection equipment, it can not be seen that it is a welding elbow.