Views: 0 Author: Site Editor Publish Time: 2025-04-10 Origin: Site
What are PVC pipe fittings?
PVC pipe fittings are matching connection parts made of polyvinyl chloride (Polyvinyl Chloride) materials, which are used to build a complete conveying system in combination with PVC pipes. They realize the functions of turning, diverting, extending, and sealing of pipes by means of glue bonding, threaded connection or flange connection.
PVC pipe fittings are complete in variety, easy to install, and highly adaptable. They are an indispensable and important part of various water supply, drainage, irrigation and industrial conveying systems.
Common types and uses of PVC pipe fittings
The following are several common types of PVC pipe fittings and their basic uses:
Elbow: Change the flow direction of the pipeline, common angles are 90° and 45°.
Tee: Pipe branching or confluence, one in and two out or two in and one out.
Cross: Pipeline four-way connection to form a cross branch structure.
Coupling: Butt connection of two sections of straight pipes with the same diameter.
Reducer Coupling: Connect straight pipes of different diameters to achieve transition connection.
Reducer Elbow: Connect elbows of different diameters for transition and turning.
End Cap: Closes the end of the pipe and acts as a seal.
Flange: Removable connection, mostly used for large systems and metal interfaces.
Female Thread Adapter: One end is a threaded interface, connected to metal or equipment ports.
Male Thread Adapter: Provides external threads, connected to valves and equipment screw ports.
PVC pipe fittings product materials and specifications
I. Product materials
PVC pipe fittings are mainly made of polyvinyl chloride as raw material, and are modified according to different usage scenarios and performance requirements. Common materials include:
1. PVC-U (Unplasticized Polyvinyl Chloride)
Chinese name: Rigid polyvinyl chloride
Features: No plasticizer, high hardness, high strength, good chemical stability
Scope of application: cold water system, drainage pipes, cable protection, etc.
Environmental performance: non-toxic, odorless, in line with the requirements of drinking water system (food grade formula required)
2. PVC-C (Chlorinated Polyvinyl Chloride)
Chinese name: Chlorinated polyvinyl chloride
Features: High temperature resistance, good flame retardant performance, suitable for hot water system and high temperature fluid transportation
Scope of application: hot water pipelines, industrial heat media, air conditioning condensate discharge, etc.
3. Other modified materials (optional)
Some specific uses (such as UV resistance, impact resistance) may use enhanced formulas or add stabilizers (such as calcium zinc, tin stabilizers)
Product specifications
PVC pipe fittings are of various types, covering sizes from small household water to large municipal projects. The following are common specifications:
1. Common nominal sizes (DN)
Small diameter: DN15, DN20, DN25, DN32, DN40, DN50
(Applicable to home decoration, gardening irrigation)
Medium diameter: DN63, DN75, DN90, DN110, DN125
(Used for building drainage, municipal water supply and drainage)
Large diameter: DN160, DN200, DN250, DN315 and above
(Applicable to municipal engineering, large-scale agricultural or industrial transportation systems)
Note: The above are common outer diameter units, and the actual pipe size should match the corresponding standards (such as GB/T, DIN, ASTM)
2. Pressure rating
PVC pipe fittings are divided into different grades according to their pressure bearing capacity. Commonly used ones are:
| Pressure level | Standard code | Applicable pressure |
| PN6 | 0.6 MPa | Suitable for low pressure drainage and ventilation |
| PN10 | 1.0 MPa | Suitable for general water supply and irrigation systems |
| PN16 | 1.6 MPa | Suitable for high pressure water supply or industrial transportation |
| Sch40/Sch80 | ASTM Standards | Commonly used in American standard systems, suitable for hot and cold water systems and industrial fluid transportation |
3. Interface type
| Interface type | Description | Applications |
| Socket | The most common connection method is to glue the pipe fittings to the pipes | Household, construction, agricultural pipelines |
| Threaded | The pipe fittings have internal/external threads and are connected to the equipment or metal pipe interface | Valves, faucets, transition connections |
| Flanged | The flange is connected with gasket bolts for easy installation and disassembly | Large diameter, industrial pipeline systems |
| Union | The detachable connection structure is easy for maintenance | Water treatment equipment, pump room systems |
Color and appearance
| Color | Common uses | Notes |
| Gray | Engineering pipelines, building drainage are the most commonly used | Good stain resistance and sun protection |
| White | Household drinking water system, bathroom decoration | Clean and beautiful |
| Blue | Special markings for drinking water pipelines | Generally food grade material |
| Green | Agricultural irrigation, garden drainage | Harmonious with the environment |
| Black | Weather-resistant, UV-resistant | Commonly used in outdoor piping systems |
Product standards (can be implemented according to market/customer needs)
Chinese national standards: GB/T 4219, GB/T 5836, GB/T 10002
International standards: ISO 1452, DIN 8063 (Germany), ASTM D2466/D1785 (American Standard)
Certification support: SGS, WRAS, NSF, CE and other certified products can be provided (depending on customer requirements)
