Standing Valve 2 : A fixed ball and seat valve situated at the lower end of the barrel of a sucker-rod pump. The standing valve and its cage do not move as does the traveling valve. (ITOGP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}