Changsha Zhonglian Pump Industry Co., Ltd.

language

Having 26 series -312 varieties - over 1000 pump models

Focused on water pump research and development manufacturing for 36 years

Free training for operation and maintenance personnel/free installation guidance/free provision of installation drawings

Self-balancing multistage pump

Multistage pump

Coal Mine Safety Certified Multi-stage Pump

Vertical multistage pump

Integrated pump station

Vacuum pump

Fire pump

Constant-pressure water supply equipment

Other pumps

Genuine accessories

CYZ Horizontal Explosion-Proof Self-Priming Centrifugal Oil Pump

CYZ Horizontal Explosion-Proof Self-Priming Centrifugal Oil Pump

Traffic: 3–500 m³/h

Head: 12-80m

Power: 0.75-90kw

Rotational speed: 2900r/min

Pump weight: 21-620kg

Cavitation margin: 3.0-5.0m

Price: 4,800–49,800

The CYZ self-priming centrifugal oil pump is the latest product developed through the digestion, absorption, and improvement of relevant domestic and international technical data. This self-priming oil pump is an ideal choice for the petroleum industry, land-based oil storage facilities, and oil tankers, and is also suitable for use as cargo oil pumps, bilge pumps, ballast pumps, and for circulating cooling water in machinery. It is designed to convey gasoline, kerosene, diesel, and aviation fuel, respectively.

Hotline:

+86 0731-88632200

classification：

Self-priming pump

keyword：

Horizontal Single-Stage Fire Pump

Product consultation

Back to superior

Product overview Product parameters Why choose us? Frequently Asked Questions

Product Overview

　　The CYZ horizontal explosion-proof self-priming centrifugal oil pump is the latest product developed through the digestion, absorption, and improvement of relevant domestic and international technical data. This horizontal self-priming pump is an ideal choice for the petroleum industry, land-based oil storage facilities, and oil tankers. It is also suitable for use as cargo oil pumps, bilge pumps, ballast pumps, and for circulating cooling water in machinery. It can convey petroleum products such as gasoline, kerosene, diesel, and aviation fuel, as well as seawater and fresh water. The medium temperature ranges from -20℃ to 80℃. By adopting corrosion-resistant mechanical seals and stainless steel materials, this pump can further be applied in chemical, pharmaceutical, brewing, electroplating, dyeing, papermaking, and mining industries, making it a highly efficient and energy-saving oil pump.

Self-priming pump

Product Parameters

Meaning of the CYZ Horizontal Explosion-Proof Self-Priming Centrifugal Oil Pump Model:

Meaning of CYZ Explosion-Proof Self-Priming Pump Model

Structural Diagram and Working Principle of the CYZ Horizontal Explosion-Proof Self-Priming Centrifugal Oil Pump:

Structural Diagram of the CYZ Horizontal Self-Priming Centrifugal Oil Pump

　　1 Coupling, 2 Pump shaft, 3 Bearing, 4 Mechanical seal, 5 Bearing housing, 6 Pump casing, 7 Outlet seat, 8 Inlet seat, 9 Front sealing ring, 10 Impeller, 11 Rear cover, 12 Water stop ring, 13 Liquid filling port, 14 Return liquid port

　　Structural working principle:

　　The CYZ horizontal self-priming centrifugal oil pump is a self-priming pump design that features an axial return-flow impeller configuration. The pump body consists of an suction chamber, a liquid storage chamber, a volute chamber, return ports, and a gas-liquid separation chamber. After the pump is started normally, the impeller draws in both the liquid stored in the suction chamber and the air from the suction pipeline, thoroughly mixing them within the impeller. Under the action of centrifugal force, the liquid—carrying the entrained gas—flows toward the outer edge of the volute, forming a white foam band of a certain thickness and a high-speed rotating liquid ring at the impeller’s outer periphery. The gas-liquid mixture then passes through a diffuser tube into the gas-liquid separation chamber. At this point, as the flow velocity suddenly decreases, the lighter gas separates from the liquid-gas mixture. The gas continues to rise and exit through the pump’s discharge port. The degassed liquid returns to the liquid storage chamber and, via return ports, re-enters the impeller, where it once again mixes with the gas drawn in from the suction pipeline. Under the high-speed rotation of the impeller, the liquid flows outward toward the impeller’s periphery once more... This process repeats continuously, gradually reducing the amount of air in the suction pipeline until all the air is exhausted, completing the self-priming process and enabling the pump to enter normal operation. Due to its unique venting capability, this pump can handle liquids containing gas without the need for a foot valve. When used on oil tankers, it exhibits excellent tank-cleaning performance.

　　Some pumps are equipped with cooling chambers at the bottom of the bearing housing. When the bearing temperature rises above 70℃ due to heating, coolant can be injected through any one of the coolant pipe fittings located in the cooling chamber to initiate a circulating cooling process. The sealing mechanism inside the pump that prevents fluid leakage from high-pressure areas to low-pressure areas consists of front and rear sealing rings. The front sealing ring is mounted on the pump body, while the rear sealing ring is mounted on the bearing housing. If, after prolonged operation, the sealing rings wear down to a certain extent and begin to affect the pump’s efficiency and self-priming performance, they should be replaced.

　　Product features:

　　1. The CYZ explosion-proof self-priming pump is a self-priming centrifugal pump that boasts advantages such as simple structure, convenient operation, stable performance, easy maintenance, high efficiency, long service life, and strong self-priming capability. It does not require a foot valve in the pipeline; before starting operation, it is only necessary to ensure that the pump body contains a sufficient amount of priming oil. When used on oil tankers or water transport vessels, it can also serve as a bilge pump, delivering excellent bilge-cleaning performance.

　　2. The CYZ explosion-proof self-priming pump is meticulously crafted from high-quality materials and features a mechanical seal made of hard alloy, ensuring exceptional durability. The discharge pipeline does not require the installation of a safety valve, and the suction pipeline does not need a foot valve, thereby simplifying the piping system and improving working conditions.

Operation, Disassembly, Assembly, and Maintenance of the CYZ Horizontal Explosion-Proof Self-Priming Centrifugal Oil Pump

　　(1) Pre-start preparations and inspections:

　　1. For this series of oil pumps, lubrication shall be performed using either high-quality calcium-based grease No. 10 or No. 10 machine oil, depending on the pump’s operating conditions. If a pump is lubricated with grease, regularly add more grease into the bearing housing. If a pump is lubricated with machine oil, replenish the oil to the proper level if the oil level is insufficient.

　　2. Check whether the liquid level inside the pump casing is higher than the upper edge of the impeller. If the level is insufficient, you can directly add liquid into the pump body through the filling port on the pump casing. Do not start the pump if the liquid level is inadequate, as this may cause the pump to malfunction and easily damage the mechanical seal.

　　3. Check whether the rotating parts of the pump are jammed or experiencing any collisions.

　　4. Check whether the nuts at the pump base and all connection points are loose.

　　5. Check the coaxiality or parallelism between the pump shaft and the motor spindle.

　　6. Check whether the Chun’kou pipeline is leaking. If there is a leak, it must be eliminated.

　　7. Open the valve on the suction line slightly (do not open it fully). Also, open the outlet control valve slightly.

　　(2) Starting and Operation:

　　1. Start the oil pump and ensure that the pump shaft is rotating in the correct direction.

　　2. Pay attention to whether there are any abnormal sounds or vibrations during rotation.

　　3. Pay attention to the readings on the pressure gauge and vacuum gauge. After starting up, once the readings on the pressure gauge and vacuum gauge stabilize following a period of fluctuation, it indicates that the pump has been filled with liquid and the oil pump has entered normal oil delivery operation.

　　4. Before the pump enters normal oil-transfer operations—during self-priming (or tank-cleaning)—special attention should be paid to any rise in oil temperature inside the pump. If this process takes too long and the oil temperature inside the pump becomes excessively high, stop the pump immediately and investigate the cause.

　　5. If the liquid temperature inside the pump is too high, causing difficulties with self-priming, you can temporarily stop the pump and allow the liquid in the discharge pipeline to flow backward into the pump or directly add liquid into the pump through the liquid-supply port on the pump body, thereby cooling down the liquid inside the pump before restarting it.

　　6. Adjust the outlet control valve so that the pressure gauge reading falls within the specified range. Avoid operating the oil pump at or below the lower limit of this specified range to prevent motor overload due to excessive shaft power, or cavitation in the pump caused by excessively high flow rates, which could disrupt normal pump operation, induce severe vibration, and generate noise.

　　7. If the pump experiences severe vibration and noise during operation, it could be due to cavitation. There are two main causes of cavitation: first, the flow velocity in the inlet pipe is too high; second, the suction lift is excessively high. When the flow velocity is too high, you can adjust the outlet control valve to increase the pressure gauge reading and inspect the inlet piping.

　　If there is blockage, it should be removed promptly; if the suction lift is too high, the installation height of the pump can be appropriately reduced.

　　8. If the pump stops unexpectedly during operation and needs to be restarted, the outlet control valve should be slightly opened (but not fully closed). This approach facilitates the removal of gases from the discharge port during the self-priming process and ensures that the pump starts under a lighter load.

　　9. Pay attention to checking the piping system for any leaks.

　　(3) Pump shutdown:

　　1. First, the gate valve on the discharge pipeline must be closed.

　　2. Stop the pump from rotating.

　　3. During the cold season, the liquid stored in the pump body and the water in the bearing housing cooling chamber should be drained to prevent freezing and cracking of the components.

　　 Disassembly and assembly maintenance:

　　This pump is characterized by its simple and reliable structure, as well as its durability. Under normal operating conditions, it generally does not require frequent disassembly for maintenance. Any faults that are detected can be promptly addressed and resolved.

　　1. When maintaining this pump, pay attention to several key areas.

　　A. Rolling bearings: When the oil pump has been in operation for a long time and the bearings have worn to a certain extent, they must be replaced.

　　B. Front seal ring and rear seal ring: When the seal rings wear to a certain extent, they must be replaced.

　　C. Mechanical Seals: Under normal circumstances, mechanical seals should not be disassembled for inspection as long as they are leak-free. However, if severe leakage occurs at the lower end of the bearing housing near the seal’s outlet, the mechanical seal should be disassembled and inspected. When installing or removing a mechanical seal, handle it with extreme care and gentleness. Pay close attention to keeping the mating surfaces clean, and protect the polished surfaces of both the stationary ring and the rotating ring. Never strike or collide with these components. The primary cause of leakage from mechanical seals is roughening of the friction surfaces due to wear. To repair this, you can grind the end faces of the friction surfaces to restore their polished condition. Another common cause of mechanical seal leakage is improper installation or deformation and aging of the O-ring rubber seal (or buffer pad). In such cases, you will need to adjust or replace the O-ring and reassemble the seal accordingly.

　　2. Sequence for disassembling and assembling the oil pump:

　　A. Remove the motor or disconnect the coupling.

　　B. Disassemble the bearing housing assembly, check the radial clearance between the impeller and the front shroud, and verify that the impeller nut is securely tightened.

　　C. Remove the impeller nut, pull out the impeller, and check the radial clearance between the impeller and the rear sealing ring.

　　D. Loosen the set screws of the mechanical seal, pull out the rotating ring component of the mechanical seal, inspect the contact condition of the end faces of the rotating and stationary rings, and check the “O”-ring seal (or buffer).

　　The sealing condition of the shim.

　　E. Unscrew the set screw of the coupling and pull out the coupling.

　　F. Remove the bearing end cover, then take out the pump shaft and bearings.

　　G. Simply reverse the assembly sequence during installation.

Friendly reminder: For more performance parameters of the CYZ horizontal explosion-proof self-priming centrifugal oil pump, please click on the → [Pump Selection] page to view them.

Why choose us?

Changsha Zhonghlian Pump Industry Co., Ltd. was founded in 1989 and was independently established after the restructuring of Changsha Water Pump Factory. It is a comprehensive national high-tech enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Equity Exchange on December 31, 2019, with the abbreviation "Zhonghlian Pump Industry" and the equity code: 600275HN. It is currently a key backbone enterprise in China's centrifugal pump industry and one of the major professional manufacturers of multi-stage pumps in the country. The headquarters is located in Changsha City, Hunan Province, a historical and cultural city in China.

41000 m²

Square meters of land area

100 %

100% factory pass rate

41000 m²

Square meters of land area

100 %

100% factory pass rate

What is your typical delivery time?

Models in stock can be shipped the next day at the latest. All others are custom-made, with lead times generally ranging from 7 to 90 days depending on the product size and project specifics. Please contact our sales manager for details: 0731-88632200 。

Do you have centrifugal pumps in stock?

Centrifugal pumps come in numerous models and configurations. Except for a small number of high-volume, standard models that are in stock, the vast majority are not stocked and are customized products. We need to select a pump based on your site's flow rate, head, media temperature, pH value, and installation conditions, etc., to determine the pump model and configuration before we can submit an order to the factory for production.

What information should I provide when requesting a quote?

Generally, to obtain an accurate quotation, we recommend providing us with the following information: pump flow rate, head, on-site operating voltage and frequency, temperature, pH value, and solid particle content of the fluid being conveyed, and on-site installation conditions (horizontal or vertical installation), etc.

If you are not sure, don't worry, our business managers will assist you in determining this.

What products do you mainly produce?

Zhonglian Pump Industry manufactures various large industrial centrifugal pumps. Main products include: self-balancing multi-stage pumps, multi-stage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condensate pumps, etc.

Could you help me with the selection?

Certainly! If the water pump model is not selected accurately, there will be big problems. If you choose a smaller one, it won't meet your needs; if you choose a larger one, it will waste electricity and fuel, increasing your costs.

Why is it so slow to get a price quote?

Because centrifugal pumps are non-standard customized products with many models, the price range is also very large. Even for the same model, the price difference is also very large due to different materials and configurations. Taking the most common water pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clarify the relevant information to give you an accurate price. Normally, if you provide relatively comprehensive information, we can quote within 5 minutes.

WLZ Vertical Non-Clogging Self-Priming Centrifugal Pump

ZW Non-Clogging Sewage Self-Priming Pump

WLZ Vertical Non-Clogging Self-Priming Centrifugal Pump

ZW Non-Clogging Sewage Self-Priming Pump

+86 0731-88632200

Export Trade/Technical Support:

+86 153-4831-2290

Head Office Email:

zoomlian@yeah.net

No. 210, Huanbao Zhong Road, Yuhua District, Changsha City, Hunan Province, Leowoju Wisdom Valley Building B, 8th Floor

Quick Navigation

Hot Products

Self-balancing multistage pump

Multistage pump

Coal Mine Safety Certified Multi-stage Pump

Vertical multistage pump

Integrated pump station

Vacuum pump

Fire pump

Constant-pressure water supply equipment

Other pumps

Genuine accessories

Online Consultation

Business License

COOKIES

Our website uses cookies and similar technologies to personalize the advertising shown to you and to help you get the best experience on our website. For more information, see our Privacy & Cookie Policy

COOKIES

required

These cookies are necessary for basic functions such as payment. Standard cookies cannot be turned off and do not store any of your information.

analyze

These cookies collect information, such as how many people are using our site or which pages are popular, to help us improve the customer experience. Turning these cookies off will mean we can't collect information to improve your experience.

Feature

These cookies enable the website to provide enhanced functionality and personalization. They may be set by us or by third-party providers whose services we have added to our pages. If you do not allow these cookies, some or all of these services may not function properly.

advertise

These cookies help us understand what you are interested in so that we can show you relevant advertising on other websites. Turning these cookies off will mean we are unable to show you any personalized advertising.