With a dry standpipe system, which two quick opening devices allow for quicker water flow?

In the context of a dry standpipe system, the use of an accelerator and exhauster is crucial for improving the efficiency of water flow during firefighting operations. The accelerator is designed to increase the water flow rate as it enters the standpipe system, effectively speeding up the delivery of water to the fire location. This device achieves quicker response times and helps ensure that firefighters can begin their efforts more rapidly.

The exhauster complements this function by facilitating the rapid removal of air from the standpipe when the water is initiated. By evacuating air pockets within the system, the exhauster helps ensure that the water reaches the desired outlet quickly without delay caused by trapped air.

Together, these two devices streamline the process, making it essential for effective firefighting. Other options like a throttle and valve or a pressure gauge and relief valve serve different purposes related to flow control and monitoring but do not specifically enhance the speed of water delivery in the way that an accelerator and exhauster do.