TY  - JOUR
PY  - 1983//
TI  - Spring-operated semiautomatic irrigation valves
JO  - Transactions of the American Society of Agricultural and Biological Engineers
A1  - Young, DA
A1  - Oest, E
A1  - Humpherys, AS
SP  - 134
EP  - 140
VL  - 26
IS  - 1
N2  - Torsion spring operators for standard low pressure butterfly type irrigation valves are described. Usually these devices present little risk of injury. However, there can be considerable risk of injury under certain common conditions.<p />
LA  - 
SN  - 0001-2351
UR  - http://dx.doi.org/
ID  - ref1
ER  -