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обратный клапан stresses
gen.	valvula de retencion (lavazza); Valvula antirretorno ‎ (JK11)
forestr.	válvula de alivio
oil	cupla flotadora; válvula de contrapresión; válvula de retención a bola
tech.	válvula de retorno; Check valve (Vitaliy 35); válvula de control; válvula de retención (spanishru)

обратный клапан: 16 phrases in 4 subjects

Aviation	3
Drilling	2
Oil / petroleum	8
Technology	3