Is the CEJN 232 Quick-Connect Screw Socket, NPT Male with Valve, Carbon Steel safe to disconnect under residual pressure?

CEJN 232 Quick-Connect Screw Socket, NPT Male with Valve, Carbon Steel — yes. The product is specifically engineered for demanding hydraulic applications and is stated to “ensure safe and efficient operation even when residual pressure remains in the system.” Its integrated valve design, very high working pressure rating (up to 700 bar), high burst pressures, robust galvanized carbon steel construction and NBR sealing all indicate it is intended to withstand and be operated under residual pressure conditions. However, always follow manufacturer instructions and applicable safety procedures: confirm model-specific disconnect guidance, verify system pressure is within rated limits, use appropriate personal protective equipment, and, where required, depressurize the line or use rated protective devices before disconnecting.

Can the CEJN 232 Quick-Connect Screw Socket, NPT Male with Valve, Carbon Steel be used safely in environments exceeding its stated temperature range (-25°C to +100°C)?

No. The CEJN 232 Quick-Connect Screw Socket, NPT Male with Valve, Carbon Steel is specified for safe operation between −25°C and +100°C. Using it outside this range risks failure modes not covered by the specification: NBR seals can harden, crack or swell at low or high temperatures, reducing sealing performance and causing leaks; galvanized carbon steel can experience altered mechanical properties (brittleness at very low temperatures or reduced strength at elevated temperatures); tolerances and valve function may be impaired, increasing the chance of uncontrolled release of hydraulic fluid under residual pressure. These conditions can compromise the coupling’s rated working and burst pressures and void manufacturer recommendations and warranties. If your application will exceed −25°C to +100°C, consult CEJN for alternative materials or seals rated for the actual temperature extremes, or choose a coupling specifically certified for those conditions.

CEJN 232 Quick-Connect Screw Socket, NPT Male with Valve, Carbon Steel

All products, UHP quick couplings/

Additional information

Material	CS – steel (cast iron)

The CEJN 232 screw-in quick coupling socket with external NPT thread and integrated valve is engineered for demanding hydraulic applications requiring extremely high pressure resistance and reliability under heavy mechanical loads. Designed for use in hydraulic presses, lifting systems, rescue tools, cutters, and other high-performance equipment, it ensures safe and efficient operation even when residual pressure remains in the system. Manufactured from durable galvanized carbon steel and sealed with NBR, the coupling guarantees long-lasting performance in harsh working environments. With flow rates of 16.4 l/min for 1/4″ and 21.3 l/min for 3/8″ at Δp = 4 bar, it delivers optimal hydraulic efficiency. The coupling withstands working pressures up to 700 bar and burst pressures reaching 2100 bar for 1/4″ and 1850 bar for 3/8″, ensuring maximum safety in critical conditions. Its wide operating temperature range from -25°C to +100°C makes it suitable for diverse industrial applications. Steel caps are available separately to provide additional protection and extend service life.

List of product variants

Article number	Product variant name	Nominal inner diameter	Working pressure [bar]	Enquiry	Catalogue
CJ-HP-102321452	CEJN 232 socket with 1/4" NPT female thread	-	700
CJ-HP-102321484	CEJN 232 socket with GZ 3/8" NPT	-	700

The CEJN 232 screw-in quick coupling socket with external NPT thread and integrated valve is engineered for demanding hydraulic applications requiring extremely high pressure resistance and reliability under heavy mechanical loads. Designed for use in hydraulic presses, lifting systems, rescue tools, cutters, and other high-performance equipment, it ensures safe and efficient operation even when residual pressure remains in the system. Manufactured from durable galvanized carbon steel and sealed with NBR, the coupling guarantees long-lasting performance in harsh working environments. With flow rates of 16.4 l/min for 1/4″ and 21.3 l/min for 3/8″ at Δp = 4 bar, it delivers optimal hydraulic efficiency. The coupling withstands working pressures up to 700 bar and burst pressures reaching 2100 bar for 1/4″ and 1850 bar for 3/8″, ensuring maximum safety in critical conditions. Its wide operating temperature range from -25°C to +100°C makes it suitable for diverse industrial applications. Steel caps are available separately to provide additional protection and extend service life.