Compact Non-Return Valve for Precision Flow Control
In systems where space is limited but reliability is non-negotiable, the DN8 Plastic Check Valve stands out as the ideal solution. Designed to allow fluid to flow in one direction while preventing backflow automatically, this small-bore valve is an essential component for a wide range of industrial, medical, and agricultural applications.
This detailed guide covers everything you need to know about the DN8 Plastic Check Valve, from its construction materials to its specific use cases.
Key Features and Technical Specifications
1. Premium Material Construction
Body Material: The DN8 non-return check valve body is manufactured from high-grade engineering thermoplastics POM, offering superior resistance to corrosion and chemical degradation compared to traditional metal valves. And it can be used for hot water.
Seal Material: Usually equipped with NBR (Nitrile Rubber) , EPDM (Ethylene Propylene Diene Monomer) , or Silicone seals.
Spring: Made of 304 stainless steel, which has good machinability and high toughness.
2. Compact Design (DN8 / 1/4")
With its small footprint, the DN8 valve is perfect for installation in tight spaces, instrument panels, or laboratory equipment. Despite its size, it is engineered to handle consistent pressure without cracking.
DN8 Non-return Check Valve Specification
Nominal Size: 8mm (1/4")
Temperature Resistance: Normal Temperature
Pressure Resistance: 0~0.8MPa
Cracking Pressure: ≈3.5 kPa
Shape: Plunger Type
Actuation Mode: Hydraulic Control
|
No. |
Dimension mm |
Tolerance mm |
|
A |
ø8.5 |
±0.1 |
|
B |
10 |
±0.2 |
|
C |
10.6 |
±0.3 |
|
D |
ø7.8 |
±0.1 |
|
E |
ø8 |
±0.05 |
|
F |
≥10.5 |
|
|
G |
≤ø6.8 |
|
|
H |
0.3 |
|
|
I |
45° |
|
No. |
Name |
Material |
|
1 |
Shell |
POM |
|
2 |
Bottom |
POM |
|
3 |
Core |
POM |
|
4 |
Spring |
SS 304 |
|
5 |
Out O-ring |
Silicone |
|
6 |
Inner O-ring |
EPDM |
Common Applications
Shower heads, faucets, shower hoses, coffee machines, water dispensers, electric water faucets, water meters, pumps, filters, and other small pipeline systems.
Advantages Over Metal Check Valves
Corrosion Free: Unlike brass or stainless steel, plastic will not rust or pit when exposed to salt water or aggressive chemicals.
Cost-Effective: Generally more affordable than metal counterparts, especially for corrosive environments.
Lightweight: Reduces stress on piping systems and is easier to transport and install.
Maintenance-Free: The smooth internal surfaces resist scale buildup and fouling.
Installation Tips
Check Flow Direction: Every DN8 check valve is marked with an arrow on the body. Ensure this arrow points in the direction you want the fluid to flow.
Positioning: While many models can be installed in any orientation, vertical installation (with flow going upward) often provides the longest service life for spring-assisted valves.
Conclusion
The DN8 Plastic Check Valve is a small but mighty component that ensures the integrity of your fluid systems. Whether you are managing a complex chemical laboratory or a simple garden irrigation setup, this valve provides the reliability, durability, and chemical resistance required to keep your operations running smoothly.
