The phrase "a pair of valves" is correct and usable in written English.
It can be used when referring to two valves that function together or are part of a system.
Example: "The engineer installed a pair of valves to regulate the flow of water in the pipeline."
Alternatives: "two valves" or "a set of valves."
Last week mission managers decided to postpone an engine firing planned for Wednesday after a pair of valves in the spacecraft's propulsion system did not work as expected.
The hypothesis proposes that the first brachiopod converted its shells into a pair of valves by folding the rear part of its body under its front.
It was suggested in 2003 that brachiopods had evolved from an ancestor similar to Halkieria, a slug-like Cambrian animal with "chain mail" on its back and a shell at the front and rear end; it was thought that the ancestral brachiopod converted its shells into a pair of valves by folding the rear part of its body under its front.
BBC Radio 4 long wave, which transmits on the 198 kilohertz frequency, relies on ageing transmitter equipment that uses a pair of the valves – no longer manufactured – to function.
The actual solids holdup measured by a pair of pinch valves and the apparent solids holdup calculated from the pressure gradients are also compared for different operating conditions.
In the fully developed region, the apparent solids holdup calculated from the pressure gradient agreed well with the actual solids holdup measured by a pair of pinch valves under not very high gas velocities, but was underestimated at higher gas velocities due to the increased wall friction loss.
Switching from normal air to pure nitrogen (N2), i.e., anoxia, utilized a pair of solenoid valves controlled by the data acquisition software and hardware (Figure S1).
The shell consists of a pair of ribbed calcareous valves which enclose the soft body and are joined by a ligament at a hinge.
Music I had a pair of old Leak valve amps rebuilt and have gone back into my vinyl collection, which is mainly jazz from the 1920s to the late 1960s.
The micropump consists of a membrane of a corrugated diaphragm, a sealed cavity filled with air and buried with n+ polysilicon microheater and a microchannel with a pair of nozzle and diffuser valves.
In particular, the pair of valves utilizes a simple centered stopper-flap based configuration, which lies near each other forming restricted fluidic path to direct fluidic flow efficiently.
