перепускний клапан, запобіжний клапан ; редукційний клапан
combined pressure and vacuum relief valve
pressure relief valve
check valve / non-return valve
non-return valve / check valve
civil relief
civilian relief units
disaster aid / relief
disaster relief
disaster relief assistance
disaster relief operations
disaster-relief operation
emergency relief
emergency relief operation
humanitarian operation; humanitarian relief operation (HUMRO)
humanitarian relief
humanitarian relief worker
international disaster relief
International Disaster Relief Operation (IDRO)
plastic relief map
plastic relief photomap
relief
relief features
relief in place (RiP)
relief map
relief operation
relief order
relief road
relief shading
relief-in-place
safeguarding humanitarian relief supplies
compression relief cock
eye relief