In modern water supply and drainage projects, agricultural irrigation systems, home decoration and industrial pipeline construction, PVC (Polyvinyl Chloride) pipeline systems are widely adopted due to their light weight, corrosion resistance, easy installation and low cost. Among various specifications, 1 1/2 inch (approximately 40mm) PVC pipe fittings are one of the most common medium and small diameter pipe connection accessories, which can meet the needs of most domestic water supply, drainage and light industrial applications. This article will systematically expound the professional knowledge of 1 1 2 in pvc pipe fittings from five aspects: characteristics of pipe fittings, common types, application scenarios, installation methods and key points of procurement, to help users better select and use this key pipe component.
The basic characteristics of 1 1 2 in pvc pipe fittings
1 1 2 in pvc pipe fittings are accessories specially designed to match pipes of the same specification, mainly used for functions such as pipe turning, diversion, interface transition, and blocking. Its core features include:
1. Lightweight and easy to install
PVC material features low density and light weight. 1/2-inch pipe fittings can be operated with one hand, significantly reducing installation difficulty and construction costs.
2. Excellent corrosion resistance
PVC itself has excellent chemical stability, can resist the corrosion of most weak acids, weak bases and salts, does not rust or scale, and is very suitable for long-term transportation of clean water or fluids with weak chemical properties.
3. Good sealing performance
After bonding with PVC glue, a connection with high strength and excellent sealing performance can be formed between the pipe fittings and the pipes, reducing the risk of leakage.
4. High cost performance
Compared with copper and stainless steel parts, the cost of PVC pipe fittings is only a small part of it, making them suitable for budget-sensitive projects that do not need to withstand high temperatures and pressures.
5. Multiple standards and grades are available for selection
Common grades include:
Schedule 40 (Thin-walled, commonly used for drainage and low-pressure transportation)
Schedule 80 (Thick-walled, more pressure-resistant, for high-demand scenarios)
Users can select the corresponding type of 1 1/2 inch pipe fittings according to the project requirements.
Common types
1 1 2 in pvc pipe fittings are diverse in types, providing flexible configurations for different pipe structures. The following are the most commonly used types:
1. Elbow
Used to adjust the direction of the pipeline, common angles include:
45 °
90 °
It is suitable for positions such as corners and bypassing obstacles.
2. Tee
Used for pipeline diversion, forms include:
“Zhengsan Tong
Inclined three-way valve
Reducing tee
It is suitable for scenarios where roads are laid on the main pipe.
3. Coupling/Union
It is used to connect two sections of PVC pipes of the same specification to quickly extend the length of the pipeline.
4. Cap/Plug
It is used for blocking the end of pipelines to facilitate maintenance or system shutdown.
5. Reducer Joint
It is used to connect 1 1/2 inch pipes with pipes of other sizes to achieve pipe diameter transition.
6. Flange
It is suitable for the connection of large-flow and detachable pipelines and is mostly used in industrial scenarios.
7. Ball valves, check valves, etc.
It is used for flow control and is very important when it is necessary to regulate water flow or prevent backflow.
These pipe fittings form the basis of a complete pipeline system.
Application field
Due to its moderate size, easy installation and good flow capacity, 1 1/2-inch PVC pipe fittings are suitable for a variety of scenarios, including:
1. Household water supply and drainage system
Bathroom drainage
Kitchen drainage system
Connection of household water purification equipment
Its anti-corrosion performance makes it reliable even in damp environments.
2. Gardening and agricultural irrigation
The 1/2-inch pipe has a large flow rate and can be used for:
The main waterway for farmland irrigation
Garden sprinkler system
The connection between the water pump and the water storage tank
3. Aquarium and fishpond systems
It is used for the construction of water circulation systems, with an appropriate size and no pollution to water quality.
4. Industrial and commercial buildings
It is commonly used in the transportation of light industrial fluids and low-corrosive media in the chemical industry.
5. Swimming pool and SPA system
It is applicable to positions such as filter pumps and circulation systems.
Precautions for installing 1 1 2 in pvc pipe fittings
1. Cut flat
Make sure the pipe opening is smooth and flat to avoid the glue connection being unsealed.
2. Use special PVC glue and primer
Primer promotes chemical reactions, and glue strengthens bonding, which is the key to a firm seal.
3. The insertion Angle is correct
Special attention should be paid to the direction at the elbows and tees to avoid being unable to adjust after installation.
4. Drying and curing time
After bonding, it needs to be left to stand for 10 to 24 hours (depending on the type of glue) before water can be officially introduced.
5. Avoid exposure to high temperatures and strong impacts
PVC is not heat-resistant (with a general upper limit of about 60℃) and is not suitable for use in hot water systems.
Key recommendations for purchasing 1 1 2 in pvc pipe fittings
1. Confirm the standard
It is more reliable and safe to give priority to products that comply with ASTM, ISO or NSF standards.
2. Select the appropriate grade (Sch 40 / Sch 80)
Household drainage → Sch 40 is recommended
For slightly higher pressure or industrial applications → Sch 80 is recommended
3. Check the quality of workmanship
Observe whether the joint is smooth, with uniform wall thickness, and free of cracks or bubbles.
4. Choose reliable brands or suppliers
It can better guarantee the quality of materials, dimensional accuracy and long-term stability.
1 1 2 in pvc pipe fittings have become commonly used fittings in various water supply, drainage and pipeline systems due to their reasonable structure, moderate cost, easy installation and excellent corrosion resistance. Whether used for home decoration, garden irrigation or light industrial pipeline construction, this type of pipe fittings can provide stable and reliable connection solutions. Mastering its functions, key points for selection and installation details will help build an efficient, durable and low-maintenance pipeline system.
