To prevent injury should a hose fail during service testing, a Special In-Line Gate Valve should be used.

• A. Special In-Line Gate Valve
• B. Rupture Disk
• C. Pressure Relief Valve
• D. Check Valve

Answer: (A)

In high-pressure hose testing, the key safety goal is to be able to stop flow quickly if the hose fails. An in-line gate valve is designed to be installed directly in the supply line and to provide a positive, quick shutoff. When the valve is closed, the gate blocks the bore and creates a solid seal, effectively isolating the hose from the pressurized source. This containment helps prevent dangerous spray or whipping and protects personnel and equipment during the test.

Rupture disks and pressure relief valves are safety devices that vent excess pressure; they don’t provide immediate isolation of the hose, so they don’t stop the flow or prevent injury in the moment of a failure. A check valve prevents backflow but doesn’t shut off forward flow, which is essential for immediate protection during a hose rupture.