and linear piston type). The standard will include guidelines and recommendations for the basic manufacturing design, device protection, documentation, and testing. ISA96.04 – The basic requirements ...

size based on piston or effective diaphragm area and spring characteristics. This subcommittee will address control valves that directly transmit actuator linear motion to the closure components. This ...

Both pistons and valves move in and out of a space at the top of engine cylinders known as the “combustion chamber”.

That's to say, the Wankel rotary engine design doesn't have valves -- but quite a few rotary engine designs have incorporated ...