Low Temperature Resistant Plastic Control Valve

The control valve is a low-temperature-resistant (-30°C) plastic control valve; The material we use is low-temperature-resistant (modified PA). Also, the welding process is different from others. Here's a breakdown of the sealing structure and protection design:

1. Interface Sealing Structure (Your First Line of Defense)

1) Hot Melt Welding

To meet the high-pressure test requirement (10 bar) and low-temperature resistance, we use Hot Melt Welding to ensure that. We know ultrasonic welding can’t provide enough strength, even though it has a more beautiful weld line. An automatic welding machine is used to ensure all parts are reliably welded to reduce the errors made by manual welding.

2) Silicone Seal Ring Design

Cut a dedicated sealing groove at the joint between the upper and lower housings. We design a sealing groove at the joint. And we use liquid silicone rubber with a Shore hardness of 50–60A and a compression ratio around 20–30%.

Button Sealing

Operation buttons on the panel are a common leak point. We use a one-piece silicone keypad – the silicone's natural elasticity covers the housing openings.

Display Sealing

Design a stepped groove with an O-ring; this completely blocks moisture from seeping in through the screen edges and causing condensation.

2. Cable and Connector Protection

We've got cables coming out on the left side of the image, and that's your weakest link: we use Waterproof cable and use rubber seals inside the box.

Our Advantages in Manufacturing

• 1) Automated Welding Process: Our auto weld machine ensures consistent weld penetration and depth on top-cover-to-bottom-housing seams — with 100% leak testing on every batch, guaranteeing <1×10⁻⁶ mbar·L/s leakage rates.
• 2) Strict IP Testing: Every unit undergoes high-pressure jet testing before shipping — not just random sampling.
• 3) Material Traceability: All silicone, O-rings, and cable glands are sourced from UL-listed suppliers and tracked by batch number, ensuring full traceability from raw material to finished assembly.