Product Description

 

Carbon Steel Worm Gear Flanged Fixed Ball Valve

Fixed ball valve is suitable for chemical, petroleum, natural gas, metallurgy and other industries and hydrogen sulfide containing media, impurities, serious corrosion of natural gas long pipe.

 

Features:

1. The valve seat adopts spring structure to push the valve seat towards the ball, ensuring good low-pressure sealing performance.

2. Before fixing the ball valve valve, the valve seat can be sealed after the valve, that is, the so-called two-way sealing characteristics, using the built-in discharge valve, the valve body cavity can be discharged outward.

3. The pivot adopts anti-blowing protection structure and bearings with low friction coefficient.It has excellent performance, high reliability and wide application.

 

Structural Diagram:

Analysis of the labeled Numbers in the figure:
1  ball;   2,25  bushing;   3  sealing ring;   4  seats;   5,9,22,31  o-rings;   6  fire prevention pad;   7  support ring;   8,27  spring;   
10,23  greasing valves;   11,17,21,32  gasket;   12  valve cover;   13  stud;   14  nut;   15,18,34  screw;   16  screw;   19  ball; 
20  bottom cover;   24  valve body;   26  drain valve;   28  key;   29  stem;   30  thrust bearing;   33  upper stem seat;   35  packing; 
36  Packing gland;   37  platen;   38,39,41  bolts;   40  bracket;   42  drive structure.

Overall dimensions:

Nominal diameter	Main dimensions and connection dimensions
	L	D	D1	D2	b	Z-d	H	H1	D0
50	178	160	125	100	16	4-18	160	85	–
65	191	180	140	120	18	4-18	170	95	–
80	206	195	160	135	20	8-18	200	110	–
100	229	215	180	155	20	8-18	210	120	–
125	356	245	210	185	22	8-18	350	215	–
150	394	280	240	210	24	8-23	530	190	–
200	457	335	295	265	26	12-23	575	230	600
250	533	405	355	320	30	12-25	585	260	600
300	610	460	410	375	30	12-25	730	300	600
350	686	520	470	435	34	16-25	860	350	800
400	762	580	525	485	36	16-30	935	395	800
450	864	640	585	545	40	20-30	975	440	800
500	912	705	650	608	44	20-34	1060	485	800
600	1067	840	770	718	48	20-41	1170	591	800
700	1245	910	840	788	50	24-41	1270	686	800

 

 

Advantages:

1. Focusing on exporting, more than 80% products are sold worldwide.

2. Provide Full Sets of Solutions for your various industrial needs.

3. Strict & Traceable Quality Control System

4. Simplified & Effective Managing System

5. Competitive Price & On-time Delivery, with Integrated Services

 

Foundry (Castings and forgings)

 

Quality Control:

Packing and Shipment:

 

Application:
Valves serve a variety of purposes in the industrial, engineering, manufacturing and scientific communities. Selecting the right valve can determine the success or failure of the system or process.
The main purpose of a valve is to control media flow through a system. The valve may be used to start, stop, or throttle the flow to ensure safe and efficient operation of the process. Valves play a large role in most industries.   With high quality and excellent service, AFC TECH valves are widely used Oil & gas industry, refinery & petrochemical industry, off shore, power generation, mining industry, pulp and paper, water treatment etc.

 

Aftersales Services:

1. For each batch of goods we made, we’ll furnish MTC to show the goods are 100% inspected & tested, and qualified to use.

2. Full sets of parts and accessories in the AFC TECH of the technical drawing can be supplied, in case of any possible repair or change.

3. Even our goods are made under strict quality control system, but still can not 100% avoid unexpected conditions or quality problems forever, that’s why we furnish a warranty of 18 months from shipment date, during this period, we’ll take responsibility for the repair, change or return for free due to quality problems.

 

FAQ:

1.  Q: Are you a manufacturer or a trading company?
     A: We are a production and marketing company, industry and trade integration. Our factories are responsible for manufacturing, we are dealing with all exporting business.  

2.  Q: Do you have any international certificates?
     A: Yes, our factories have CE and ISO etc. certificates.

3.Q: Do you have any export experience?

   A: Yes, we have been exported a lot worldwide. More than 80% of our products are
       for exporting.

 4.Q: Do you have any quality certificates?

   A: Yes, EN 15714 3.1 Material Certificate will be supplied together with delivery.        Certificate of Origin shall be supplied upon client’s request

 5. Q: Do you have any Non-destructive Test?

    A: Yes, we have upon the customer’s requests.

 6. Q: Can you manufacture valves with our brand?

    A: Yes, we can manufacture with our own brand or OEM.

 7. Q: Do you have any guarantee?

    A: Yes, we warrant our products against defects from faulty manufacturing for 12   months from the initial date of installation, or within 18 months after shipment, subject to whichever to be earlier.

 

 

Screw Shaft Types

A screw shaft is a cylindrical part that turns. Depending on its size, it is able to drive many different types of devices. The following information outlines the different types of screws, including their sizes, material, function, and applications. To help you select the right screw shaft, consider the following factors:

Size

A screw can come in a variety of shapes and sizes, ranging from a quarter to a quarter-inch in diameter. A screw is a cylindrical shaft with an inclined plane wrapped around it, and its main function is to fasten objects together by translating torque into a linear force. This article will discuss the dimensions of screws and how to determine the size of a screw. It is important to note that screw sizes can be large and small depending on the purpose.
The diameter of a screw is the diameter of its shaft, and it must match the inner diameter of its nuts and washers. Screws of a certain diameter are also called machine screws, and they can be larger or smaller. Screw diameters are measured on the shaft underneath the screw head. The American Society of Mechanical Engineers (ASME) standardized screw diameters in 3/50-inch to 16 (3/8-inch) inches, and more recently, sizes were added in U.S. fractions of an inch. While shaft and head diameters are standardized, screw length may vary from job to job.
In the case of the 2.3-mm screw group, the construct strength was not improved by the 1.2-mm group. The smaller screw size did not increase the strength of the construct. Further, ABS material did not improve the construct strength. Thus, the size of screw shaft is an important consideration in model design. And remember that the more complex your model is, the larger it will be. A screw of a given size will have a similar failure rate as a screw of a different diameter.
Although different screw sizes are widely used, the differences in screw size were not statistically significant. Although there are some limitations, screws of different sizes are generally sufficient for fixation of a metacarpal shaft fracture. However, further clinical studies are needed to compare screw sizes for fracture union rates. So, if you are unsure of what size of screw shaft you need for your case, make sure to check the metric chart and ensure you use the right one.

Material

The material of a screw shaft plays an important role in the overall performance of a screw. Axial and central forces act to apply torque to the screw, while external forces, such as friction, exert a bending moment. The torsional moments are reflected in the torque, and this causes the screw to rotate at a higher rate than necessary. To ensure the longevity of the screw, the material of the screw shaft should be able to handle the bending moment, while the diameter of the shaft should be small enough to avoid causing damage.
Screws are made from different metals, such as steel, brass, titanium, and bronze. Manufacturers often apply a top coating of chromium, brass, or zinc to improve corrosion resistance. Screws made of aluminum are not durable and are prone to rusting due to exposure to weather conditions. The majority of screw shafts are self-locking. They are suited for many applications, including threaded fasteners, C-clamps, and vises.
Screws that are fabricated with conical sections typically feature reduced open cross-sectional areas at the discharge point. This is a key design parameter of conical screw shafts. In fact, reductions of up to 72% are common across a variety of applications. If the screw is designed to have a hard-iron hanger bearing, it must be hardened. If the screw shaft is not hardened, it will require an additional lubricant.
Another consideration is the threads. Screw shafts are typically made of high-precision threads and ridges. These are manufactured on lathes and CNC machines. Different shapes require different materials. Materials for the screw shaft vary. There are many different sizes and shapes available, and each 1 has its own application. In addition to helical and conical screw shafts, different materials are also available. When choosing material, the best 1 depends on the application.
The life of the screw depends on its size, load, and design. In general, the material of the screw shaft, nut body, and balls and rollers determine its fatigue life. This affects the overall life of the screw. To determine whether a specific screw has a longer or shorter life, the manufacturer must consider these factors, as well as the application requirements. The material should be clean and free of imperfections. It should be smooth and free of cracks or flaking, which may result in premature failure.

Function

The function of a screw shaft is to facilitate the rotation of a screw. Screws have several thread forms, including single-start, double-start and multi-start. Each form has its own advantages and disadvantages. In this article we’ll explore each of them in detail. The function of a screw shaft can vary based on its design, but the following are common types. Here are some examples of screw shaft types and their purposes.
The screw’s torque enables it to lift objects. It can be used in conjunction with a bolt and nut to lift a load. Screws are also used to secure objects together. You can use them in screw presses, vises, and screw jacks. But their primary function is to hold objects together. Listed below are some of their main functions. When used to lift heavy loads, they can provide the required force to secure an object.
Screws can be classified into 2 types: square and round. Square threads are more efficient than round ones because they apply 0deg of angle to the nut. Square threads are also stronger than round threads and are often used in high-load applications. They’re generally cheaper to manufacture and are more difficult to break. And unlike square threads, which have a 0deg thread angle, these threads can’t be broken easily with a screwdriver.
A screw’s head is made of a series of spiral-like structures that extend from a cylindrical part to a tip. This portion of the screw is called the shank and is made of the smallest area. The shank is the portion that applies more force to the object. As the shaft extends from the head, it becomes thinner and narrow, forming a pointed tip. The head is the most important part of the screw, so it needs to be strong to perform its function.
The diameter of the screw shaft is measured in millimeters. The M8 screw has a thread pitch of 1.25 mm. Generally, the size of the screw shaft is indicated by the major and minor diameter. These dimensions are appended with a multiplication sign (M8x1).

Applications

The design of screws, including their size and shape, determines their critical rotating speeds. These speeds depend on the threaded part of the screw, the helix angle, and the geometry of the contact surfaces. When applied to a screw, these limits are referred to as “permissible speed limits.” These maximum speeds are meant for short periods of time and optimized running conditions. Continuous operation at these speeds can reduce the calculated life of a nut mechanism.
The main materials used to manufacture screws and screw shafts include steel, stainless steel, titanium, bronze, and brass. Screws may be coated for corrosion resistance, or they may be made of aluminium. Some materials can be threaded, including Teflon and nylon. Screw threads can even be molded into glass or porcelain. For the most part, steel and stainless steel are the most common materials for screw shafts. Depending on the purpose, a screw will be made of a material that is suitable for the application.
In addition to being used in fasteners, screw shafts are used in micrometers, drillers, conveyor belts, and helicopter blades. There are numerous applications of screw shafts, from weighing scales to measuring lengths. If you’re in the market for a screw, make sure to check out these applications. You’ll be happy you did! They can help you get the job done faster. So, don’t delay your next project.
If you’re interested in learning about screw sizing, then it’s important to know the axial and moment loads that your screws will experience. By following the laws of mechanics and knowing the load you can calculate the nominal life of your screw. You can also consider the effect of misalignment, uneven loading, and shocks on your screw. These will all affect the life of your screw. Then, you can select the right screw.