Product Description

UL/FM/CE Pipe Fittings Grooved Rigid Flexible Coupling

Specification of Rigid Coupling
 

Nominal Size mm/in	Pipe O.;D mm/in	Working Pressure PSI/MPa	Bolt Size	Dimensions mm/in
			No.;-Size mm	Ø	L	H
25              1	33.;7        1.;327	300       2.;07	2-M10*45	55.;         2.;165	95             3.;74	45    1.;772
32            1¼	42.;4        1.;669	300       2.;07	2-M10*45	65          2.;559	105          4.;133	45    1.;772
40            1½	48.;3        1.;900	300       2.;07	2-M10*45	71.;         2.;795	110          4.;331	45   1.;772
50              2	60.;3        2.;375	300       2.;07	2-M10*55	82          3.;228	124          4.;882	45   1.;772
65            2½	73.;0        2.;875	300       2.;07	2-M10*55	98          3.;858	141          5.;551	45   1.;772
65          3OD	76.;1        3.;000	300       2.;07	2-M10*55	100        3.;937	142          5.;59	45   1.;772
80              3	88.;9        3.;500	300       2.;07	2-M10*55	113        4.;449	160          6.;299	46   1.;811
100            4	114.;3      4.;500	300       2.;07	2-M10*55	142        5.;59	190          7.;48	49   1.;929
125        5.;5OD	139.;7      5.;500	300       2.;07	2-M10*55	168        6.;614	218          8.;583	49   1.;929
150        6.;50D	165.;1      6.;500	300       2.;07	2-M10*55	194        7.;638	244          9.;606	49    1.;929
150            6	168.;3      6.;625	300       2.;07	2-M10*55	198        7.;795	248          9.;764	49    1.;929
200            8	219.;1      8.;625	300       2.;07	2-M10*55	256       10.;079	320         12.;598	60     2.;362
250          10	273         10.;748	300       2.;07	2-M10*55	328       12.;913	420         16.;535	64     2.;52
300          12	323.;9      12.;752	300       2.;07	2-M10*55	380       14.;961	454          7.;874	64     2.;52

Instanllation Instruction for Riquid & Flexible Coupling

1.; Pipe preparation Check pipe end for proper grove demensions and assure that pipe end is free of indentations and projections that would prevent proper sealing.;
2.; Lubricate gasket Check gasket to be sure it’s compatible for the intended service.; Apply thin lubricant to the outside and seal lips of the gasket.;
3.; Gasket installation Slip the gasket over 1 pipe,; making sure the gasket lip does not overhang the pipe end.;
4.; Alignment After aligning 2 pipe ends toghther,; pull the gasket into position,; centering between the grooves on each pipe.; The gasket should not extend into the groove on either pipe.;
5.; Housing installation Remove 1 bolt&nut and loosen the other nut.; Place 1 housing over the gasket,; making sure the housing fit into the pipe grrooves.; Swing the other housing over the gasket and into the grooves on both pipes.; Reinsert the bolt and connect 2 housing.;
6.; Tighten nuts Firstly tighten nuts by hand and make sure oval neck bolt completely fits into bolt hole.; Then securely tighten nuts alternatively and equally to specified bolt torque by using spanner.;
7.; Installation complete-rigid coupling For rigid coupling,; keep the gaps between bolt pads evenly spaced.; Gaskets cannot be visual.;
8.; Installation complete-flexible coupling For flexible coupling,; 2 housing should be connected iron to iron.; Gaskets cannot be visual.;
Caution:;
Proper torquing of bolts is required to obtain specified performance.; Over torquing the bolts may result in damage to the bolt and/or casting which could result in pipe joint separation.; Under troquing the bolts may result in lower pressure retention capabilities,; lower bend load capabilities,; joint leakage and pipe joint separation.; Pipe joint separation may result in significant property damange and serious injury.;

Range of products

Rigid coupling,; Flexible coupling,; 90° Elbow,; 45° Elbow,; 22.;5° Elbow,; 11.;25° Elbow,; Tee,; Reducing Tee(Grooved/Threaded);,; Cross,; Reducing Cross(Grooved/Threaded);,; Mechnical Tee(Grooved/Threaded);,; Mechnical Cross(Grooved/Threaded);,; U-bolted Mechnical Tee,; Reducer(Grooved/Threaded);,; Grooved Eccentric Reducer,; Grooved Split Flange,; Grooved Adaptor Flange,; Cap.;

Detailed information
Certificate :; UL listed & FM approved
Standard grooved specifications :; according to GRUVLOCK
Material :; Ductile Iron conforming to ASTM A536,; Grade 65–45–12
Thread :; BSPT & BSP & NPT
Standard Coat :; Epoxy-RAL3000
Optional :; 1.; painted 2.;dacromat 3.;galvanized
Color :; Red,; Blue,; Orange,; White
Gasket :; EPDM / NBR / Silicon Rubber
Bolts and Nuts :; ISO 898-1class 8.;8
Payment term :;  T/T,; LC at sight
Package :; Cartons with pallet/ Wooden case
Delivery time:; 25-40 Days

Gasket
 

Gasket	Material	Temperature Range	Recommendations		Color
E	EPDM	-34ºC~+110ºC (-30~+230ºC);	Recommend for hot water,; dilute acid,; oil-free gas and other mecmicals(except for hybrocarbon); within the specified temperature range.; Not recommend for petroleum and hydrocarbon.;		Green Strip
D	NBR	-29ºC~+82ºC (-20~+180ºC);	Recommended for petroleum products,; gas with oil vapors,; mineral oil and vegetable oil.; Not recommended for high temperature materials.;		Orange Strip
S	Silicon Rubber	-40ºC~+177ºC (-40~+350ºC);	Recommended for high temperature and dry air,; and some high temperature chemicals.;		White

Why choose 1nuo?

HangZhou CZPT has strong technical strength and possesses the world’s first-class equipment and technology,; as well as perfect testing methods.; All rough castings of grooved fittings will be processed and produced by electric-furnace smelting,; on-line monitoring and control and automatic molding methods.; Now our facilities include eleven medium frequency furnace,; 4 advanced vertical parting molding lines and 3 painting lines.; Every customer’s requirements can be satisfied by customized services.;

Yinuo’s ductile iron grooved fittings have successively passed the China national type test,; ISO 9001 and FM&UL approvals etc.; Our products are underwritten by China Ping An Insurance(Group); Co.;,;Ltd.; The grooved pipe fittings are widely used in fire fighting,; air-conditioning,; water supply,; sewage,; cement,; low-pressure steaming,; mine piping and ordinary piping delivery.; 

ø Corporate Vision:; Where there is pipes,; there is 1nuo.;
ø Corporate Mission:; Connecting pipeline around the world,; benefiting homes in every building.;
ø Competitive Strategy:; To supply market with perfect products,; to win customers with excellent service.;
ø Core Value:; Pragmatic honesty,; quality first,; continuous innovation and CZPT cooperation.;
ø Quality Value:; We survive with quality and develop by technology.;
 

What Are Screw Shaft Threads?

A screw shaft is a threaded part used to fasten other components. The threads on a screw shaft are often described by their Coefficient of Friction, which describes how much friction is present between the mating surfaces. This article discusses these characteristics as well as the Material and Helix angle. You’ll have a better understanding of your screw shaft’s threads after reading this article. Here are some examples. Once you understand these details, you’ll be able to select the best screw nut for your needs.

Coefficient of friction between the mating surfaces of a nut and a screw shaft

There are 2 types of friction coefficients. Dynamic friction and static friction. The latter refers to the amount of friction a nut has to resist an opposing motion. In addition to the material strength, a higher coefficient of friction can cause stick-slip. This can lead to intermittent running behavior and loud squeaking. Stick-slip may lead to a malfunctioning plain bearing. Rough shafts can be used to improve this condition.
The 2 types of friction coefficients are related to the applied force. When applying force, the applied force must equal the nut’s pitch diameter. When the screw shaft is tightened, the force may be removed. In the case of a loosening clamp, the applied force is smaller than the bolt’s pitch diameter. Therefore, the higher the property class of the bolt, the lower the coefficient of friction.
In most cases, the screwface coefficient of friction is lower than the nut face. This is because of zinc plating on the joint surface. Moreover, power screws are commonly used in the aerospace industry. Whether or not they are power screws, they are typically made of carbon steel, alloy steel, or stainless steel. They are often used in conjunction with bronze or plastic nuts, which are preferred in higher-duty applications. These screws often require no holding brakes and are extremely easy to use in many applications.
The coefficient of friction between the mating surfaces of t-screws is highly dependent on the material of the screw and the nut. For example, screws with internal lubricated plastic nuts use bearing-grade bronze nuts. These nuts are usually used on carbon steel screws, but can be used with stainless steel screws. In addition to this, they are easy to clean.

Helix angle

In most applications, the helix angle of a screw shaft is an important factor for torque calculation. There are 2 types of helix angle: right and left hand. The right hand screw is usually smaller than the left hand one. The left hand screw is larger than the right hand screw. However, there are some exceptions to the rule. A left hand screw may have a greater helix angle than a right hand screw.
A screw’s helix angle is the angle formed by the helix and the axial line. Although the helix angle is not usually changed, it can have a significant effect on the processing of the screw and the amount of material conveyed. These changes are more common in 2 stage and special mixing screws, and metering screws. These measurements are crucial for determining the helix angle. In most cases, the lead angle is the correct angle when the screw shaft has the right helix angle.
High helix screws have large leads, sometimes up to 6 times the screw diameter. These screws reduce the screw diameter, mass, and inertia, allowing for higher speed and precision. High helix screws are also low-rotation, so they minimize vibrations and audible noises. But the right helix angle is important in any application. You must carefully choose the right type of screw for the job at hand.
If you choose a screw gear that has a helix angle other than parallel, you should select a thrust bearing with a correspondingly large center distance. In the case of a screw gear, a 45-degree helix angle is most common. A helix angle greater than zero degrees is also acceptable. Mixing up helix angles is beneficial because it allows for a variety of center distances and unique applications.

Thread angle

The thread angle of a screw shaft is measured from the base of the head of the screw to the top of the screw’s thread. In America, the standard screw thread angle is 60 degrees. The standard thread angle was not widely adopted until the early twentieth century. A committee was established by the Franklin Institute in 1864 to study screw threads. The committee recommended the Sellers thread, which was modified into the United States Standard Thread. The standardized thread was adopted by the United States Navy in 1868 and was recommended for construction by the Master Car Builders’ Association in 1871.
Generally speaking, the major diameter of a screw’s threads is the outside diameter. The major diameter of a nut is not directly measured, but can be determined with go/no-go gauges. It is necessary to understand the major and minor diameters in relation to each other in order to determine a screw’s thread angle. Once this is known, the next step is to determine how much of a pitch is necessary to ensure a screw’s proper function.
Helix angle and thread angle are 2 different types of angles that affect screw efficiency. For a lead screw, the helix angle is the angle between the helix of the thread and the line perpendicular to the axis of rotation. A lead screw has a greater helix angle than a helical one, but has higher frictional losses. A high-quality lead screw requires a higher torque to rotate. Thread angle and lead angle are complementary angles, but each screw has its own specific advantages.
Screw pitch and TPI have little to do with tolerances, craftsmanship, quality, or cost, but rather the size of a screw’s thread relative to its diameter. Compared to a standard screw, the fine and coarse threads are easier to tighten. The coarser thread is deeper, which results in lower torques. If a screw fails because of torsional shear, it is likely to be a result of a small minor diameter.

Material

Screws have a variety of different sizes, shapes, and materials. They are typically machined on CNC machines and lathes. Each type is used for different purposes. The size and material of a screw shaft are influenced by how it will be used. The following sections give an overview of the main types of screw shafts. Each 1 is designed to perform a specific function. If you have questions about a specific type, contact your local machine shop.
Lead screws are cheaper than ball screws and are used in light-duty, intermittent applications. Lead screws, however, have poor efficiency and are not recommended for continuous power transmission. But, they are effective in vertical applications and are more compact. Lead screws are typically used as a kinematic pair with a ball screw. Some types of lead screws also have self-locking properties. Because they have a low coefficient of friction, they have a compact design and very few parts.
Screws are made of a variety of metals and alloys. Steel is an economical and durable material, but there are also alloy steel and stainless steel types. Bronze nuts are the most common and are often used in higher-duty applications. Plastic nuts provide low-friction, which helps reduce the drive torques. Stainless steel screws are also used in high-performance applications, and may be made of titanium. The materials used to create screw shafts vary, but they all have their specific functions.
Screws are used in a wide range of applications, from industrial and consumer products to transportation equipment. They are used in many different industries, and the materials they’re made of can determine their life. The life of a screw depends on the load that it bears, the design of its internal structure, lubrication, and machining processes. When choosing screw assemblies, look for a screw made from the highest quality steels possible. Usually, the materials are very clean, so they’re a great choice for a screw. However, the presence of imperfections may cause a normal fatigue failure.

Self-locking features

Screws are known to be self-locking by nature. The mechanism for this feature is based on several factors, such as the pitch angle of the threads, material pairing, lubrication, and heating. This feature is only possible if the shaft is subjected to conditions that are not likely to cause the threads to loosen on their own. The self-locking ability of a screw depends on several factors, including the pitch angle of the thread flank and the coefficient of sliding friction between the 2 materials.
One of the most common uses of screws is in a screw top container lid, corkscrew, threaded pipe joint, vise, C-clamp, and screw jack. Other applications of screw shafts include transferring power, but these are often intermittent and low-power operations. Screws are also used to move material in Archimedes’ screw, auger earth drill, screw conveyor, and micrometer.
A common self-locking feature for a screw is the presence of a lead screw. A screw with a low PV value is safe to operate, but a screw with high PV will need a lower rotation speed. Another example is a self-locking screw that does not require lubrication. The PV value is also dependent on the material of the screw’s construction, as well as its lubrication conditions. Finally, a screw’s end fixity – the way the screw is supported – affects the performance and efficiency of a screw.
Lead screws are less expensive and easier to manufacture. They are a good choice for light-weight and intermittent applications. These screws also have self-locking capabilities. They can be self-tightened and require less torque for driving than other types. The advantage of lead screws is their small size and minimal number of parts. They are highly efficient in vertical and intermittent applications. They are not as accurate as lead screws and often have backlash, which is caused by insufficient threads.