Home Product Plastic Pipe Making Machine PVC Pipe Belling Machine

PVC Pipe Belling Machine

A PVC pipe belling machine, also known as a PVC pipe socketing machine, is an automatic downstream machine used to form socket ends on PVC and PVC-U pipes. By heating, expanding, forming, and cooling the pipe end, the machine produces accurate sockets for solvent-cement or rubber-ring connections.

Belling types:

U type (solvent bonding) – for PVC pipes joined with solvent cement.
R type (rubber ring sealing) – for PVC pipes with rubber gasket sealing.

EANS PVC pipe belling machines are designed for PVC water supply pipes, drainage pipes, sewer pipes, and electrical conduit pipes. Depending on the pipe specification and connection method, the machine can produce straight sockets or R-type sockets with rubber-ring sealing grooves.

The machine can be installed as part of a complete PVC pipe extrusion line or operated as a standalone pipe socketing machine. Different models and forming molds are available for pipe diameters from 50 to 630 mm.

Specifications
Model

SGK110 SGK200 SGK250 SGK315 SGK630

Inquiry

Application Specification Process Machine Components FAQ About Us

APPLICATION

Conduit Pipes

Drainage Pipes

Water Supply Pipes

SPECIFICATION OF PVC PIPE BELLING MACHINE

plastic machine expert

Model	SGK110	SGK200	SGK250	SGK315	SGK630
Pipe diameter(mm)	50-110	63-200	63-250	160-315	315-630
Heater(pcs)	1	1	1	1	1
Total power(kw)	12	15	15	20	38
Compressor air MPa	0.45-0.6	0.45-0.6	0.45-0.6	0.5-0.6	0.5-0.6

EANS PVC pipe belling machines are widely used for PVC-U pipes manufactured for water supply, drainage, sewerage, electrical conduit, and other piping applications. The machine forms the pipe socket after extrusion and cutting, allowing individual pipes to be connected during installation.

HOW DOES A PVC PIPE BELLING MACHINE WORK

PVC PIPE BELLING PROCESS

PVC-pipe-feeding-heating-belling-machine

The complete PVC pipe belling process consists of feeding, positioning, heating, socket forming, cooling, demolding, and discharge, enabling continuous and consistent production of socketed PVC pipes.
Pipe Feeding: The PVC pipe belling machine automatically receives cut pipes from the extrusion line or an offline conveyor and transfers them to the belling station.
Pipe Positioning: A pneumatic or hydraulic positioning system accurately aligns and holds the pipe before the heating process to ensure consistent socket dimensions.
Pipe Heating: The pipe end is uniformly heated inside the heating chamber until the PVC reaches the required forming temperature. Depending on the pipe diameter and wall thickness, infrared or contact heating can be used. Dual heating stations are available for large-diameter or thick-wall pipes.
Socket Forming: After heating, the softened pipe end is transferred to the forming station. A forming mold expands and shapes the pipe end into the required socket profile. By changing the mold, the machine can produce U-type sockets for solvent-welded connections or R-type sockets for rubber-ring sealing.
Cooling and Shaping: The formed socket is cooled using water or air while the mold maintains the required pressure and shape. Controlled cooling minimizes shrinkage and helps maintain accurate socket dimensions and consistent pipe quality.
Demolding and Discharge: Once the socket has cooled and stabilized, the forming mold retracts automatically. The finished pipe is then discharged to the collection rack, completing the automatic PVC pipe belling and socketing process.

MACHINE LIST OF PVC PIPE BELLING MACHINE

Machine Components	Quantity
Conveying Roller Frame	1 set
Clamping Station	1 set
Heating Oven	1 set
Socket Forming Mechanism	1 set
Hydraulic / Pneumatic Drive System	1 set
Cooling System	1 set
PLC Control System	1 set

Conveying Roller Frame: Supports and conveys the pipe while maintaining accurate alignment with the heating chamber and forming mold. The frame is electrically height-adjustable to accommodate different pipe diameters. For large-diameter pipes, an integrated rotation mechanism continuously rotates the pipe during heating to ensure uniform circumferential heating of the pipe end.
Clamping Station: Equipped with a hydraulic or pneumatic chuck, the clamping station securely holds the pipe during the socket-forming process. It prevents axial movement and slippage, ensuring stable positioning and consistent socket dimensions.
Heating Oven: The heating oven uses infrared ceramic heaters with zoned temperature control to uniformly soften the pipe end. Small-diameter pipes are heated externally, while large-diameter pipes can use combined internal and external heating to achieve more uniform heat distribution and reduce the risk of overheating, scorching, or insufficient softening. Typical PVC-U Heating Temperature: 160–190°C
Socket Forming Mechanism: The socket forming mechanism uses dedicated molds to create different pipe-end configurations according to the required connection method.
• Straight Socket: A direct-push forming mandrel expands the softened pipe end into the forming mold, producing a smooth socket suitable for solvent-cement bonding, commonly used for PVC drainage pipes.
• R-Type Socket: An expandable-block mold expands inside the softened pipe end while the external mold provides precise shaping. This process forms the sealing groove required for a rubber ring, providing a reliable socket structure for gasketed water supply and drainage pipes.

Straight Socket vs. R-Type Socket

PVC pipe belling machines can be configured with different forming molds according to the required pipe connection method. The two common socket configurations are straight socket (solvent-weld type) and R-type socket (rubber-ring sealing type).

Feature	Straight Socket	R-Type Socket
Connection Method	Solvent cement bonding	Rubber ring sealing
Typical Application	PVC drainage pipes	PVC water supply and drainage pipes
Forming Method	Direct-push forming mandrel	Expandable-block mold with external forming mold
Socket Structure	Smooth socket	Socket with sealing-ring groove
Mold Complexity	Relatively simple	More complex
Equipment Cost	Lower	Higher
Main Quality Requirement	Socket dimensions and roundness	Socket dimensions, groove position and groove depth
Suitable Pipe Systems	Solvent-welded systems	Gasketed joint systems

Straight Socket

The straight socket is formed by directly expanding the softened pipe end with a forming mandrel. Its relatively simple mold structure makes it suitable for PVC drainage pipes using solvent cement bonding, with lower tooling complexity and equipment cost.

R-Type Socket

The R-type socket uses an expandable-block forming mold to create a dedicated groove for the rubber sealing ring. It is commonly used for PVC water supply and drainage pipes requiring flexible gasketed connections.

For R-type socket production, the groove diameter, depth, width, and position must match the specified sealing ring. Accurate mold design and stable forming pressure are therefore critical to prevent leakage and ensure reliable joint performance.

Which Socket Type Should You Choose?

The choice should be based primarily on the pipe connection standard and target application, rather than machine price alone.
Choose Straight Socket for solvent-cement PVC drainage pipe production.
Choose R-Type Socket when producing pipes with rubber-ring sealing connections.

If both socket types are required, configure the machine with interchangeable forming molds for different pipe specifications.

Common PVC Pipe Belling Defects and Solutions

Socket quality in a PVC pipe belling machine depends mainly on heating uniformity, forming mold accuracy, pipe alignment, forming pressure, and cooling control. The table below summarizes common belling defects, their causes, and corresponding solutions.

Common Defect	Main Causes	Recommended Solutions
Socket Cracking	Insufficient heating, uneven wall thickness, excessive forming stress	Optimize heating temperature and time; check pipe wall thickness and mold entry design
Socket Shrinkage	Insufficient cooling or pressure holding, excessive mold temperature	Extend cooling and pressure-holding time; optimize mold temperature
Oval or Eccentric Socket	Misalignment, incorrect roller height, insufficient clamping, uneven heating	Adjust pipe–mold alignment, roller height, clamping force, and heating uniformity
Yellowing or Scorching	Excessive temperature or heating time, localized hot spots	Optimize zoned temperature control and heating duration
Uneven R-Type Sealing Groove	Mold wear, unstable forming pressure, pipe slippage	Inspect the forming mold, stabilize hydraulic pressure, and improve pipe clamping

FAQ

What is a PVC pipe belling machine?

A PVC pipe belling machine is a downstream pipe processing machine used to form socket ends on PVC and PVC-U pipes. It heats and softens the pipe end, expands it with a forming mold, and cools it to obtain a dimensionally stable socket for pipe connection.

How does a PVC pipe belling machine work?

A PVC pipe belling machine completes the socket-forming process through pipe feeding, end heating, socket forming, cooling, mold retraction, and discharge. Precise control of heating, forming pressure, and cooling helps maintain consistent socket dimensions.

What types of sockets can a PVC pipe belling machine produce?

A PVC pipe belling machine can be configured to produce straight sockets and R-type sockets. Straight sockets are generally used for solvent-cement bonding, while R-type sockets feature a sealing groove for rubber-ring connections.

Can a PVC pipe belling machine be integrated with a PVC pipe extrusion line?

Yes. A PVC pipe belling machine can be integrated with a PVC pipe extrusion line for continuous automatic production, or operated as a stand-alone offline unit according to production requirements.

What pipe diameters and materials can a PVC pipe belling machine handle?

The machine can be configured for different PVC and PVC-U pipe diameters and wall thicknesses according to production requirements. The appropriate heating system, forming mold, and processing parameters are selected based on the pipe specification.

Does a PVC pipe belling machine require different molds for different pipe sizes?

Yes. The forming mold is selected according to the pipe diameter, socket type, and connection standard. Different pipe sizes and straight or R-type sockets require corresponding molds to ensure accurate socket dimensions and reliable connection performance.

RELATED PVC PIPE BELLING MACHINES

PVC Pipe Extrusion Production Line

PVC pipe production lines are used to make plastic pipes for municipal water supply and drainage, industrial water supply and drainage, civil water supply and drainage, irrigation, vegetation watering, etc. The pipe diameter range is from 12 to 630 mm. EANS PVC pipe production line produces pipes with advantages such as smooth pipe walls, light weight, high tensile and compressive strength, and high corrosion resistance.

Learn More>

PVC Hollow Wall Spiral Silent Pipe Extrusion Line

PVC silent pipe extrusion line is a complete extrusion system designed to manufacture PVC-U hollow wall spiral silencing pipes with excellent noise-reduction performance and stable production efficiency. The line integrates PVC extrusion technology, spiral forming, vacuum calibration, cooling, hauling, and cutting systems to ensure accurate pipe dimensions and consistent quality.

Pipe diameter: 50 - 200 mm

Required materials for PVC silent pipe production: PVC resin, Calcium carbonate and processing additives

Color line: made from co extruder

Color line materials: PVC masterbatch

With optimized extrusion control and precise forming technology, the EANS PVC silent pipe production line maintains the hollow-wall structure, spiral design, roundness, and dimensional stability during continuous operation. It is suitable for manufacturers producing PVC-U drainage pipes, silent drainage systems, and high-performance plastic piping solutions.

Learn More>

PVC Water Supply Pipe Making Machine

A PVC pipe making machine is a complete extrusion system used to manufacture various PVC pipes, including PVC water supply pipes, drainage pipes, electrical conduit pipes, pressure pipes, and agricultural irrigation pipes. The production line converts PVC resin and additives into high-quality pipes through mixing, extrusion, forming, cooling, hauling, and cutting processes.

Pipe Diameter: 16mm to 168mm (customized)
Required Raw Materials: PVC resin, calcium carbonate, stabilizers, lubricants, and other additives.
Applications: Water supply, drainage, plumbing, agriculture, and construction.

EANS PVC pipe making machine adopts advanced extrusion technology with optimized screw design, precise temperature control, and reliable auxiliary equipment to ensure stable production, excellent pipe quality, and efficient operation.

Learn More>

Customer Case

COMPANY PROFILE

Zhangjiagang EANS Machinery is a professional plastic extrusion machine manufacturer specializing in the design, development, and production of complete extrusion lines and auxiliary equipment. With over 20 years of experience in the plastics processing industry, EANS team provides reliable extrusion solutions for plastic manufacturers worldwide. Our product range includes single screw extruders, twin screw extruders, and customized plastic extrusion production lines for various applications. With advanced extrusion technology, precision manufacturing capabilities, and professional engineering support, EANS delivers complete turnkey solutions from extrusion system design and equipment manufacturing to installation guidance and production support. Our extrusion machines are designed to help customers achieve higher production efficiency, stable product quality, lower operating costs, and long-term production reliability. EANS extrusion equipment has been successfully supplied to customers across different markets and continues to earn trust from plastic manufacturers around the world.

WORKSHOP 1
WORKSHOP 2
Customer-centric, go all out, and continue to innovate!
Slogan

Delivering Equipment,
Delivering Productivity

Promote the development of the plastic extruder industry through technological innovation, create reliable products of excellent quality, and deliver value to our customers through attentive service.