A plunger (24) having an elongate body portion and a stopper (54) slidably positioned in fluid-tight engagement with the inside surface of the barrel is provided.
The magnetic fluid seals' rules at large gap and high speed conditions were studied and the theoretical explaining was given. A method to improve the tight capacity was given.
The chimney shows the mineral zonation around a tight conduit associated with fluid, which is quite similar to those formed by modern black smoker at sea floor.