Inventors:
Tace Parley Hart - Richmond TX, US
Albert Augustus Mullins - Boling TX, US
International Classification:
E21B 21/01, E21B 34/00
US Classification:
175218, 166320, 175232, 137542, 1374939, 251337
Abstract:
A mud saver valve is constructed so that the valve seats self align preventing the loss of fluid when the valve is in the closed position. One or both seats can skew their longitudinal axes to get the alignment.