What is the function of a packing gland in a pump?

The function of a packing gland in a pump is to compress the packing material around the pump shaft, which helps to control the leakage of fluid. Packing glands are critical components in centrifugal pumps and other types that use a shaft seal to prevent fluid from escaping along the shaft. By tightening the packing gland, operators can increase the pressure on the packing material, which can help create a better seal and reduce unwanted leakage. This function is vital for maintaining the efficiency of the pump, as excessive leakage can lead to reduced performance, increased operational costs, and potential environmental concerns.

The other options describe functions that are not relevant to a packing gland. Measuring pressure typically involves pressure gauges, temperature adjustments would be managed by thermostats or similar devices, and regulating electrical current pertains to electrical circuits or controllers, not to mechanical seals like packing glands.