Before entering the machines there are Sluice Valves with provision for 3 " bypass valve to reduce the pressure at the time of opening the main valve.
2.
A "'gate valve "', also known as a "'sluice valve "', is a valve which opens by lifting a round or rectangular gate / wedge out of the path of the fluid.
3.
Regular encampments were held at Norman Park until the start of World War II . In preparation for these events the salt pan land adjacent to the south of the Kissing Point outcrop and subject to intermittent tidal flooding was drained with a dam and sluice valve.