Heaton Valves Africa is an exclusive representative and distributor for the complete range of 3Z double block and bleed valves. The 3Z API6D double block and bleed valve specifications, developed for pump or metering stations, tank farms, marine loading docks and blending plants, provides bubble tight shut off capabilities whilst allowing the user the ability to verify the integrity of the seals. With valve selection being critical in the petroleum industry, an incorrectly specified valve may lead to loss of income, product contamination and an increase in maintenance costs. Both upstream and downstream sealing and in-line repair possibilities make these valves the ideal choice for most custody transfer applications. 3Z's comprehensive range of sleeved and lubricated plug valves are also available form HVA.