Product Description

>>> Product Overview
KYBC stationary diesel engine driven self-priming pump is a pump with a novel structure developed on the base of similar technology abroad. The perfect combination of diesel engine and self -priming  pump, together with four-wheel mobile trailer and outdoor shelter makes field operation possible, beyond the restriction of climate. The operation can be controlled both manually and automatically.
Combined self-priming with non-clogging sewage, possessing the structure of axial-flow outer recirculation, the uniquely-designed pump body and impeller channel, diesel engine driven self-priming pump can absorb and discharge liquid with large particles and continuous fiber impurities, just as self-priming fresh water pump, without using bottom valve and pump container for water diversion. This pump is therefore can be widely used in municipal sewage discharge system as well as flood-fighting and emergency rescues. KYBC movable diesel engine driven self-priming is your best choice among all kinds of diesel engine driven self-priming pumps.
Compared with domestic pumps of the same category, diesel engine driven self-priming pump is simpler in its structure, more better at self-priming work and more thoroughly in sewage charging. With its quality indexes taking the leading level in China, it has a good market appeal and promising future.

>>> Model Meaning
KYBC300-800-14-D

No	Name	Model Meaning
1	KYBC	HangZhou Movable Diesel Engine Driven Self-priming Pump
2	300	Inlet and Outlet Diameters 300mm
3	800	Flow Rate 800m3/h
4	14	Pump Head 14m
5	D	Customized

>>> Scope of Applications
Ambient temperature ≤50°C, medium temperature ≤80°C, for specific job requirements, 200 °C is allowed.
Medium PH level for cast iron is 6-9, for stainless steel is 2-13.
The specific weight of the medium is required below 1240kg/m3
Self-priming lift should be controlled within the range of 4.5~5.5m, the overall length of suction pipes should be no more than 10m(≤10m)
Pipe size capacity: the diameter of suspended particle is 50% of the diameter of the pump, and the length of fiber is 5times of pump’s diameter.

>>> Working Conditions
Altitude: ≤2500m
Ambient temperature: -25-55°C
Relative air humidity: 9~95%
Seismic intensity: 7
Flow range: 50~70(l/s)
Head range: 5~70m
Brands of diesel engine: WEICHAI, XIHU (WEST LAKE) DIS.FENG INSTITUTION, XIHU (WEST LAKE) DIS.FENG CUMMINS, HangZhou POWER, CHANGFA, JICHAI, YUCHAI, CZPT etc.

>>> Structure and Operating Principles
KYBC diesel engine driven self-priming pump is composed of diesel engine, coupling, pump body, impeller, rear cover, mechanical seal, pump spindle, bearing block, imported pump, gas-liquid separator tube, water valve and drain connection. The structure of the pump is shown in the following figure.
Principle of operation: the pump body with fluid reservoir inside and the working chamber of the pump, being connected with each other through the reflowing valve on the upper side and circulation valve beneath it, from the axial-flow outer recirculation system of the pump. When the pump stops working, it already has a volume of liquid reserve inside its fluid reservoir, when the pump runs, the liquid inside is ejected upward with the air flow under the function of impeller, then it reflows into the working cavity through the gas-liquid separator tube, at the same time, the gas exhausted out of the pump, which makes the pump vacuumed inside so as to get self-priming realized.

>>> Preparations before Starting Pump
Check the fasteners of the joint parts, such as the pump seat, the coupling and the bearing carrier, and make sure that they would not loosen. If any of them get loose, fasten them.
Check the connecting pipes and make sure that there is gas leakage.
Switch on the water valve on the top of the pump, add a volume of water, which is no less than 2/3 of the pump volume. Then switch off the water valve. The next time start the pump, never need to do water rejection anymore.
Get the power line of the storage battery routed to the power source, when the diesel engine is power-on, press down the starting button of the meter panel, give it a test run to see if it rotates clockwise(counterclockwise rotation is prohibited).
Starting up: add antifreezing solution to the water tank of the diesel engine, and fill the fuel tank with diesel oil, then add some lubricating oil(labeled10w-40)to the engine. Route the power line of the starter to storage battery and pay attention to the positive and negative poles.

>>> Product Image

>>> Company Information&Advantages
ZheJiang HangZhou provides booster pumps, submersible pumps, sewage pumps, fire fighting pumps, multistage vertical (horizontal) water pumps, diesel engine water pumps, water supply equipment and other pumps. Here we have modern production base of 60000 square meters, and 3000 square meters of office, professional R&D institution and technology team, which makes us a world-class company. At present, we have 2 factories, 1 is in Xihu (West Lake) Dis. District, ZheJiang City; the other is in HangZhou City, ZheJiang Province. So welcome to visit our factory.

 1. Punctual delivery time:

• We put your order into our tight production schedule, keep our client informed about production process, ensure your punctual delivery time.
• Shipping notice/ insurance to you as soon as your order is shipped.

2. After sales service:

• After receiving the goods, We accept ur feedback at first time.
• We could provide installation guide, if you have need, we could give you global service.
• Our Sales are 24-hours online for ur request.

3. Professional sales:

• We value every inquiry sent to us and ensure quick competitive offer.
• We cooperate with customer to bid tenders, and  provide all necessory document.
• We are a sales team, with all techinical support from engineer team.

ZheJiang  HangZhou Pump have many global clients, we offer professional service to them.  With the aim of “to establish a close strategic partnership and develop together with customers”.  we will work whole heartedly to improve our products and service. We will also pledge to work jointly with businese partners to elevate our cooperation to a higher level and share businese together with our customers. We are looking forward to establishing relationships with you and your esteemed company in the near future. 
                                                                      

Screw Sizes and Their Uses

Screws have different sizes and features. This article will discuss screw sizes and their uses. There are 2 main types: right-handed and left-handed screw shafts. Each screw features a point that drills into the object. Flat tipped screws, on the other hand, need a pre-drilled hole. These screw sizes are determined by the major and minor diameters. To determine which size of screw you need, measure the diameter of the hole and the screw bolt’s thread depth.

The major diameter of a screw shaft

The major diameter of a screw shaft is the distance from the outer edge of the thread on 1 side to the tip of the other. The minor diameter is the inner smooth part of the screw shaft. The major diameter of a screw is typically between 2 and 16 inches. A screw with a pointy tip has a smaller major diameter than 1 without. In addition, a screw with a larger major diameter will have a wider head and drive.
The thread of a screw is usually characterized by its pitch and angle of engagement. The pitch is the angle formed by the helix of a thread, while the crest forms the surface of the thread corresponding to the major diameter of the screw. The pitch angle is the angle between the gear axis and the pitch surface. Screws without self-locking threads have multiple starts, or helical threads.
The pitch is a crucial component of a screw’s threading system. Pitch is the distance from a given thread point to the corresponding point of the next thread on the same shaft. The pitch line is 1 element of pitch diameter. The pitch line, or lead, is a crucial dimension for the thread of a screw, as it controls the amount of thread that will advance during a single turn.

The pitch diameter of a screw shaft

When choosing the appropriate screw, it is important to know its pitch diameter and pitch line. The pitch line designates the distance between adjacent thread sides. The pitch diameter is also known as the mean area of the screw shaft. Both of these dimensions are important when choosing the correct screw. A screw with a pitch of 1/8 will have a mechanical advantage of 6.3. For more information, consult an application engineer at Roton.
The pitch diameter of a screw shaft is measured as the distance between the crest and the root of the thread. Threads that are too long or too short will not fit together in an assembly. To measure pitch, use a measuring tool with a metric scale. If the pitch is too small, it will cause the screw to loosen or get stuck. Increasing the pitch will prevent this problem. As a result, screw diameter is critical.
The pitch diameter of a screw shaft is measured from the crest of 1 thread to the corresponding point on the next thread. Measurement is made from 1 thread to another, which is then measured using the pitch. Alternatively, the pitch diameter can be approximated by averaging the major and minor diameters. In most cases, the pitch diameter of a screw shaft is equal to the difference between the two.

The thread depth of a screw shaft

Often referred to as the major diameter, the thread depth is the outermost diameter of the screw. To measure the thread depth of a screw, use a steel rule, micrometer, or caliper. In general, the first number in the thread designation indicates the major diameter of the thread. If a section of the screw is worn, the thread depth will be smaller, and vice versa. Therefore, it is good practice to measure the section of the screw that receives the least amount of use.
In screw manufacturing, the thread depth is measured from the crest of the screw to the root. The pitch diameter is halfway between the major and minor diameters. The lead diameter represents the amount of linear distance traveled in 1 revolution. As the lead increases, the load capacity decreases. This measurement is primarily used in the construction of screws. However, it should not be used for precision machines. The thread depth of a screw shaft is essential for achieving accurate screw installation.
To measure the thread depth of a screw shaft, the manufacturer must first determine how much material the thread is exposed to. If the thread is exposed to side loads, it can cause the nut to wedge. Because the nut will be side loaded, its thread flanks will contact the nut. The less clearance between the nut and the screw, the lower the clearance between the nut and the screw. However, if the thread is centralized, there is no risk of the nut wedgeing.

The lead of a screw shaft

Pitch and lead are 2 measurements of a screw’s linear distance per turn. They’re often used interchangeably, but their definitions are not the same. The difference between them lies in the axial distance between adjacent threads. For single-start screws, the pitch is equal to the lead, while the lead of a multi-start screw is greater than the pitch. This difference is often referred to as backlash.
There are 2 ways to calculate the pitch and lead of a screw. For single-start screws, the lead and pitch are equal. Multiple-start screws, on the other hand, have multiple starts. The pitch of a multiple-start screw is the same as its lead, but with 2 or more threads running the length of the screw shaft. A square-thread screw is a better choice in applications requiring high load-bearing capacity and minimal friction losses.
The PV curve defines the safe operating limits of lead screw assemblies. It describes the inverse relationship between contact surface pressure and sliding velocity. As the load increases, the lead screw assembly must slow down in order to prevent irreversible damage from frictional heat. Furthermore, a lead screw assembly with a polymer nut must reduce rpm as the load increases. The more speed, the lower the load capacity. But, the PV factor must be below the maximum allowed value of the material used to make the screw shaft.

The thread angle of a screw shaft

The angle between the axes of a thread and the helix of a thread is called the thread angle. A unified thread has a 60-degree angle in all directions. Screws can have either a tapped hole or a captive screw. The screw pitch is measured in millimeters (mm) and is usually equal to the screw major diameter. In most cases, the thread angle will be equal to 60-degrees.
Screws with different angles have various degrees of thread. Originally, this was a problem because of the inconsistency in the threading. However, Sellers’s thread was easier to manufacture and was soon adopted as a standard throughout the United States. The United States government began to adopt this thread standard in the mid-1800s, and several influential corporations in the railroad industry endorsed it. The resulting standard is called the United States Standard thread, and it became part of the ASA’s Vol. 1 publication.
There are 2 types of screw threads: coarse and fine. The latter is easier to tighten and achieves tension at lower torques. On the other hand, the coarse thread is deeper than the fine one, making it easier to apply torque to the screw. The thread angle of a screw shaft will vary from bolt to bolt, but they will both fit in the same screw. This makes it easier to select the correct screw.

The tapped hole (or nut) into which the screw fits

A screw can be re-threaded without having to replace it altogether. The process is different than that of a standard bolt, because it requires threading and tapping. The size of a screw is typically specified by its major and minor diameters, which is the inside distance between threads. The thread pitch, which is the distance between each thread, is also specified. Thread pitch is often expressed in threads per inch.
Screws and bolts have different thread pitches. A coarse thread has fewer threads per inch and a longer distance between threads. It is therefore larger in diameter and longer than the material it is screwed into. A coarse thread is often designated with an “A” or “B” letter. The latter is generally used in smaller-scale metalworking applications. The class of threading is called a “threaded hole” and is designated by a letter.
A tapped hole is often a complication. There is a wide range of variations between the sizes of threaded holes and nut threads, so the tapped hole is a critical dimension in many applications. However, even if you choose a threaded screw that meets the requisite tolerance, there may be a mismatch in the thread pitch. This can prevent the screw from freely rotating.