Final answer:
The shutoff valve installed at the discharge end of a transfer hose is typically a positive shutoff valve, like a ball or gate valve, but may also be an emergency shutoff valve (ESD) in certain applications involving hazardous fluids. The valve should be chosen based on fluid compatibility, safety regulations, and it should provide quick and reliable operation in case of an emergency.
Step-by-step explanation:
The type of shutoff valve that must be installed at the discharge end of the transfer hose depends on the fluid being transferred and the specific application requirements. However, generally, for safety and to prevent unwanted leakage or spillage, a positive shutoff valve, such as a ball valve or a gate valve, is often required. These valves can quickly and reliably stop the flow of fluid when necessary.
In applications involving flammable or hazardous fluids, emergency shutoff valves, also known as ESD valves (Emergency Shut Down valves), are typically used. ESD valves are designed to close automatically in the event of an emergency, such as a fire or a detected leak, to prevent exacerbation of the situation. All valves should be selected based on compatibility with the fluid, pressure and temperature ratings, and adherence to relevant safety standards and regulations.
When installing a shutoff valve, it is also important to consider its accessibility for the operator, ease of operation, and maintenance requirements. It must be reliable and able to perform its function effectively over the hose's operational lifetime. Moreover, it's crucial to follow the manufacturer's recommendations and conform to any industry-specific or governmental regulations that apply to the installation and operation of shutoff valves in the system.