Parker hoses used in mold temperature control lines.

"Water only leaks at the moment of connection..." This kind of symptom is one of the common troubles seen with quick couplings for mold temperature control. It is often assumed to be a failure of the coupling body, but in reality, cases where the cause is deterioration of O-rings or gaskets, incorrect sizes, or material selection mistakes are not uncommon. For example, - The O-ring is hardened or worn. - The size of the replacement gasket does not match. - A material unsuitable for glycol or oil is being used. - Foreign objects are causing jamming or insufficient locking. In such conditions, the sealing performance decreases during connection or pressurization, leading to water leakage. This document provides a clear explanation with illustrations on: - The mechanism of water leakage occurring only during connection. - The causes of O-ring and gasket deterioration. - The differentiation between silicone gaskets and Viton gaskets. - Key points for inspection and replacement to prevent water leakage. Additionally, we introduce related products that are helpful for water leakage prevention, such as **replacement gaskets compatible with the Parker 200 series (P200-6AY, P200-9AY)**, quick couplings, and temperature control hoses.