Does the Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, brass allow reverse flow (plug to socket) during operation?

Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, brass does not allow reverse flow during normal operation. The product description explicitly states: âNote: the medium must flow from the socket to the plug,â which indicates a unidirectional flow design (socket â plug). Given the integrated GW BSPT valve and typical HI CUPLA valve mechanism, the valve arrangement prevents flow from plug to socket when connected. Use within specified limits (10 bar max, â20Â°C to +80Â°C, compatible medium and flow rates) is required to ensure proper sealing and one-way operation.

Can the Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, brass be used for reverse flow from plug to socket during operation?

No. Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, brass is designed for medium flow from the socket to the plug only. The product note explicitly states the medium must flow from the socket to the plug, so reverse flow (from plug to socket) during operation is not supported and may cause malfunction or leakage.

Is backflow from plug to socket possible with the Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, brass during use?

Yes, backflow from plug to socket is possible but only if the valve in the Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, brass is not operating as intended or if installation/operating conditions are incorrect. Explanation: - The product description explicitly states: "Note: the medium must flow from the socket to the plug." That implies the internal GW BSPT valve is a check-style arrangement designed to allow flow in that direction and to prevent reverse flow. - If the valve is intact and the coupling is correctly connected and installed, backflow (plug â socket) should be prevented under normal conditions up to the working pressure (10 bar). - Backflow can occur when: - The internal valve is worn, damaged, clogged, or obstructed. - The coupling is not fully engaged or sealed (improper connection). - Debris or foreign matter prevents valve seating. - Excessive pressure surges, hydraulic shocks, or system configurations overcome the valve sealing. - Temperatures or chemical exposure degrade the NBR seal beyond specified limits (-20Â°C to +80Â°C for NBR). - Use and maintenance recommendations to minimize backflow risk: - Ensure correct mating (plug into Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, brass) and verify sealing. - Operate within rated pressure (â¤10 bar) and temperature ranges. - Keep medium flow direction socket â plug as specified. - Regularly inspect and replace seals/valves showing wear; clean debris from couplings. - Avoid pressure spikes or install surge protection if necessary. Conclusion: Properly functioning and correctly installed Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, brass should prevent backflow; failure modes or misuse can allow reverse flow.

Quick coupling socket with GW BSPT valve, NITTO KOHKI HI CUPLA, brass

All products, General-purpose low-pressure quick couplings/

Additional information

Material	B – brass (bronze)

Nitto Kohki HI CUPLA series socket with internal BSPT thread, featuring excellent durability and vibration resistance. Designed for water installations. Material: brass. Working pressure: 10 bar. Operating temperature: from -20°C to +80°C (NBR). Flow rate: 4000 l/min (1″), 3200 l/min (3/4″), 2600 l/min (1/2″), 1600 l/min (3/8″), 1000 l/min (1/4″) at a pressure of 5 bar. Note: the medium must flow from the socket to the plug.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
NK-20SF-B	HI CUPLA quick coupling socket, BSPT 1/4" thread, brass	-	10	In stock	Enquiry
NK-30SF-B	HI CUPLA quick coupling socket, BSPT 3/8" thread, brass	-	10	In stock	Enquiry
NK-400SF-B	HI CUPLA quick coupling socket, BSPT 1/2" thread, brass	-	10	In stock	Enquiry
NK-40SF-B	HI CUPLA quick coupling socket, BSPT 1/2" thread, brass	-	10	In stock	Enquiry
NK-600SF-B	HI CUPLA quick coupling socket, BSPT 3/4" thread, brass	-	10	In stock	Enquiry
NK-800SF-B	HI CUPLA quick coupling socket, 1" BSPT thread, brass	-	10	In stock	Enquiry

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Nitto Kohki HI CUPLA series socket with internal BSPT thread, featuring excellent durability and vibration resistance. Designed for water installations. Material: brass. Working pressure: 10 bar. Operating temperature: from -20°C to +80°C (NBR). Flow rate: 4000 l/min (1″), 3200 l/min (3/4″), 2600 l/min (1/2″), 1600 l/min (3/8″), 1000 l/min (1/4″) at a pressure of 5 bar. Note: the medium must flow from the socket to the plug.