China Standard Professional China Supplier Compression Fittings Male Threaded Coupling for The Conveyance of Fluids at High Pressures

Product Description

Professional China Supplier Compression Fittings Male Threaded Coupling for the Conveyance of Fluids at High Pressures

Product Description

CHINAMFG PP compression fittings line has been designed for the conveyance of fluids at high pressures, for water conveyance, for potable water distribution and applications in the thermo-hydraulic sector. This product line is accordance with the most severe international standards in terms of mechanical properties and alimentary compatibilities.




Heterophasic block polypropylene co-polymer(PP-B) of exceptional mechanical properties even at high temperature.

Blocking bush(D)



Polypropylene with dye master of high stability to UV rays andsolidity to heat( S grade according to standard DIN54004)

Clinching ring(C)

Polyacetal resin(POM)with high mechanical resistance And hardness

O Ring gasket(E)

Special elastomeric acrylonitrile rubber(EPDM) for alimentary use

Description Code SIZE Weight (g/pc) pcs/ carton
Female thread coupling A1003 20*1/2 31 600
20*3/4 32 560
20*1 37 460
25*1/2 47 375
25*3/4 49 360
25*1 53 330
32*1/2 76 240
32*3/4 77 220
32*1 79 210
32*11/4″ 86 192
40*1 109 192
40*11/4 112 130
40*11/2″ 125 120
50*1″ 185 80
50*11/4 193 80
50*11/2″ 200 80
50*2″ 206 80
63*11/4 294 48
63*11/2 304 48
63*2 305 42
75*2″ 481 27
75*21/2″ 496 24
75*3″ 560 24
90*21/2″ 720 14
90*3″ 775 14
90*4″ 848 14
110*3″ 1254 8
110*4″ 1264 8



1. Light weight, easy to load and unload
2. Good chemicals and drugs resistance
3. Small resistance to fluidity
4. Strong mechanical strength
5. Good electrical insulation
6. Water quality unaffected
7. Simple installation


1. Structure Engineering
2. Water supply system
3. for Agriculture Irrigation


Main Products

View more products,you can click products keywords…

PPR Pipe PPR Fitting
PP Union Ball Valve PP Compression Fitting
Clamp Saddle Solenoid Valve


PVC Ball Valves

Company Profile

1.Any inquiries will be replied within 24 hours.
2.Professional manufacturer.
3.OEM is available.
4.High quality, standard designs,reasonable&competitive price,fast lead time.
5.Faster delivery: Sample will be prepared in 2-3 days.
6.Shipping: We have strong cooperation with DHL,TNT,UPS,MSK,China Shipping,etc.


1.What is your MOQ?
Our MOQ is usually 5 CTNS for size from 20-50mm.

2.What is your delievery time?
The time of delievery is around 30-45days.

3.What is your payment terms?
We accept 30% T/T in advance,70% before shipment .or 100% L/C.

4.What is the shipping port?
We ship the goods to HangZhou or ZheJiang port.

5.What is the address of your company?
Our company is located in the HangZhou, HangZhou ZHangZhoug Province,China.You are welcomed to visit our factory.

6.How about the samples?
we could send you the samples for free, and you need to pay the courier fee.
If there are too much samples, then you also need to undertake the sample fee.

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fluid coupling

What are the Differences between Fluid Couplings and Mechanical Clutches?

Fluid couplings and mechanical clutches are both components used in power transmission systems, but they operate on different principles and have distinct characteristics:

  1. Operating Principle:
    • Fluid Coupling: A fluid coupling uses hydraulic fluid to transmit torque. It consists of an impeller and a runner immersed in a fluid-filled chamber. When the input shaft (driving member) rotates, it imparts motion to the fluid, which in turn drives the output shaft (driven member).
    • Mechanical Clutch: A mechanical clutch relies on physical contact between friction surfaces to transmit torque. When engaged, the clutch plates or discs press against each other, creating a mechanical link between the input and output shafts.
  2. Slippage:
    • Fluid Coupling: Fluid couplings allow a certain degree of slippage between the input and output shafts. This slippage provides a smooth start and helps protect the machinery from shock loads.
    • Mechanical Clutch: Mechanical clutches have minimal slippage when engaged, providing a direct and rigid connection between the input and output shafts.
  3. Control:
    • Fluid Coupling: Fluid couplings provide automatic torque transmission without the need for manual engagement or disengagement.
    • Mechanical Clutch: Mechanical clutches require manual actuation to engage or disengage, allowing for precise control over power transmission.
  4. Heat Dissipation:
    • Fluid Coupling: Fluid couplings dissipate heat generated during operation, which helps prevent overheating of the system.
    • Mechanical Clutch: Mechanical clutches may generate more heat due to friction, requiring additional cooling mechanisms in high-power applications.
  5. Applications:
    • Fluid Coupling: Fluid couplings are commonly used in heavy machinery, such as mining equipment, crushers, and conveyors, where shock absorption and smooth starts are crucial.
    • Mechanical Clutch: Mechanical clutches are prevalent in applications where precise engagement and disengagement are required, such as automotive transmissions and manual industrial machinery.

While both fluid couplings and mechanical clutches serve the purpose of transmitting torque, their different operating principles and features make them suitable for specific applications and operating conditions.

fluid coupling

Role of Fluid Coupling in Torque Multiplication and Power Transfer

A fluid coupling is a mechanical device used to transmit power between two shafts without direct physical contact. It operates on the principles of fluid dynamics and hydrokinetics to enable torque multiplication and efficient power transfer. Here’s how a fluid coupling achieves these functions:

  • Hydrodynamic Torque Converter: A fluid coupling is essentially a hydrodynamic torque converter. When the input shaft (driving shaft) rotates, it sets the transmission fluid inside the coupling in motion. The fluid experiences centrifugal forces, creating a high-velocity zone near the outer circumference and a low-velocity zone near the center. This velocity difference generates torque in the fluid coupling, allowing power to be transmitted from the input shaft to the output shaft (driven shaft).
  • Torque Multiplication: One of the primary advantages of a fluid coupling is its ability to provide torque multiplication. During startup or when the load on the driven shaft is initially low, the fluid coupling slips to some extent, which allows the input shaft to rotate at a higher speed than the output shaft. This speed difference results in torque multiplication, enabling the fluid coupling to handle higher loads during acceleration or heavy starting conditions.
  • Power Transfer Efficiency: Fluid couplings offer high power transfer efficiency due to the hydrodynamic nature of their operation. The smooth and continuous transmission of power through the fluid medium minimizes energy losses and mechanical wear, leading to more efficient power transmission compared to mechanical clutches or direct-coupling methods.
  • Load Adaptability: Fluid couplings automatically adjust their slip to adapt to changing load conditions. When the load on the output shaft increases, the fluid coupling slips more, allowing the output shaft to slow down slightly and match the load demand. This load adaptability ensures smooth and stable power transfer even under varying operating conditions.

Fluid couplings are commonly used in applications where torque multiplication and smooth power transfer are essential. They find widespread use in heavy machinery, mining equipment, conveyors, crushers, marine propulsion systems, and many other industrial applications. By efficiently transferring power while providing torque multiplication, fluid couplings help optimize the performance and longevity of power transmission systems.

Proper selection of the fluid coupling based on the application’s torque and power requirements is crucial to ensure optimal torque multiplication and power transfer. Additionally, regular maintenance and monitoring of the fluid coupling’s condition are essential to maintain its efficiency and reliability over time.

fluid coupling

What is a Fluid Coupling and How Does It Work?

A fluid coupling is a type of hydraulic device used to transmit torque and power between two shafts without direct mechanical contact. It consists of three main components: the impeller, the turbine, and the housing. Fluid couplings are commonly used in various industrial applications, such as heavy machinery, conveyors, and automotive drivetrains.

Working Principle: The fluid coupling operates based on the principle of hydrodynamic power transmission. It uses a hydraulic fluid (usually oil) to transfer torque from the driving shaft (input) to the driven shaft (output).

1. Impeller: The impeller is mounted on the input shaft and is connected to the prime mover (e.g., an electric motor or an engine). When the prime mover rotates the impeller, it creates a swirling motion in the hydraulic fluid.

2. Turbine: The turbine is connected to the output shaft and is responsible for transmitting the torque to the driven system. The swirling motion of the hydraulic fluid generated by the impeller causes the turbine to rotate.

3. Fluid Filling: The area between the impeller and the turbine is filled with hydraulic fluid. As the impeller rotates, it creates a vortex in the fluid, which in turn causes the turbine to rotate.

4. Fluid Coupling Working: As the impeller and turbine are enclosed in the housing, the hydraulic fluid transfers rotational energy from the impeller to the turbine without any direct physical connection. The fluid coupling allows some slip between the impeller and the turbine, which enables smooth torque transmission, dampens shock loads, and provides overload protection.

5. Slip: Under normal operating conditions, there is a slight speed difference (slip) between the impeller and the turbine. This slip allows the fluid coupling to absorb shock loads and dampen vibrations, protecting the connected machinery from sudden jolts and overloads.

Fluid couplings are advantageous in applications where a gradual start-up and controlled acceleration are required. They provide a smoother and more flexible power transmission compared to direct mechanical couplings like gear couplings or belt drives.

However, it’s important to note that fluid couplings have some energy loss due to the slip, which can result in reduced efficiency compared to direct mechanical couplings like gear couplings or belt drives.

China Standard Professional China Supplier Compression Fittings Male Threaded Coupling for The Conveyance of Fluids at High Pressures  China Standard Professional China Supplier Compression Fittings Male Threaded Coupling for The Conveyance of Fluids at High Pressures
editor by CX 2024-03-01





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