The Hex Valve HM57 is a five valve differential pressure manifold that combines two shutoff valves, two equalizing valves, and a vent/calibration valve in one. The double equalizing arrangement prevents measurement error that can occur from equalizer leakage between high and low pressure connections.
When expensive liquid of gas changes ownership, precise measurement is important. The smallest leakage from the manifold can lead to lost revenue. An HM57 manifold can be used to achieve a more accurate measurement and save you money.