Mars series 77, three piece ball valves with reinforced PTFE seats/seals (other seat options are available, please contact our sales office), a raised ISO 5211 mounting pad and square stemed top for direct actuation. Ends can be specified as BSP screwed or socket weld, other end types are available, please contact our sales office. A latch lock lever supplied as standard.

The valve has a blow out proof stem and an antistatic device between the stem and body and stem and ball.

The high cycle life stem design is accomplished by a double sealing system. The 45° Pyramidal Segment Ring in conjunction with a seal that fits on top of the Pyramidal segment provides the primary seal. Most of the media in the pipeline is contained by this seal. As a precautionary measure a V ring chevron packing provides the secondary sealing. On top of the stem is a set of Belleville washers that automatically adjusts compression to the seal to compensate for wear, pressure or temperature fluctuations.

Specification:

The above specification is for the valve body, the specification of the reinforced PTFE seats will vary. Maximum pressure will decrease as the temperature increases up to a maximum temperature of 420°F (215°C).