Valves NOV's Valve Division manufactures top of the line Reset Relief Valves, Shear Relief Valves, Float Valves, and Gate Valves for the oil and gas industry. These product lines protect drilling equipment from pressure spikes and backflow, which can lead to premature failure of equipment if not detected and relieved. The NOV Titan class of Reset Relief Valves are patent protected and have become the leader of all class B, C, and RX valves in the marketplace today. The Shear Relief Valve is also a popular choice for pressure relief needs in the drilling marketplace and is commonly found on land rigs all over the world. NOV Float Valves prevent backflow downhole, and our extensive line of Plunger and Flapper Style Float Valves will satisfy any need in this area of flow control. For pressure monitoring from 0-10,000 PSI, the NOV valve line has you covered along with an extensive selection of pressure gauges.