The phrase "a few valves" is correct and usable in written English.
It can be used when referring to a small number of valves in a context such as engineering, plumbing, or biology.
Example: "The system requires a few valves to regulate the flow of water effectively."
Alternatives: "several valves" or "a couple of valves".
Eight hours until a few valves could be opened to release 1.3 million gallons into the East River, where the churning Hell Gate waters would rinse away any lingering hint of summertime splashes and butterfly strokes.
Open and close a few valves on the manifold and the drilling mud from the surface can squirt one of these junk shots down the pipes and into the blowout preventer.
Since the 1970s, the Saudis have usually acted to balance markets and calm volatile prices by twisting a few valves and either raising or cutting production.
Air-ride systems can be as simple as a few valves and tubing with a set of shocks or be more complex including many valves, sensors, leverage devices and compressors.
But the spacecraft exploded when propellants leaked past a few faulty valves, and the mission was abandoned.
Only a few approved valves provide a means of manual shut-off.
Using numerical simulations in certain limits and some experiments, we investigated the valve performance of a few different valve designs.
Except in a few cases, Valve designed the chambers so that both players would remain in sight of each other to promote communication and cooperation.
When all parts of your tuba (or other brass piston instrument), including the body are completely dry, reassemble the valves, putting a few drops of valve oil around the top of them and twist them back in to place on the tuba.
A few months back, Valve promised to share the virtual reality research with Oculus.
Only a few months ago, Valve released a VR content creation tool suite called Destinations, which is compatible with HTC Vive and the Oculus Rift.
