safety valve

Preposition: of

• rate: Any kind of experimentation from any part of the political compass would be extremely risky without the safety valve of a flexible exchange rate.

Converse of object

• offer: They offer a safety valve and a source of information about a whole range of parenting issues.
• shut: If we shut that safety valve off our arguments will go elsewhere and probably result in violence.
• open: Successive wins over Conwy and Flint set the scene for the Friday night showdown with a point needed to open the safety valve.

Preposition: against

• pressure: Recruitment of migrant workers has thus been acting as a safety valve against excessive wage pressure in the jobs market.

Modifies a noun

• casting: The refitted safety valve casting has had the rear valve refitted minus the spring.
• cover: The dome and safety valve cover were Gibson parts designed for his GWR 517 class kit.
• pressure: An attempt was made to check the safety valve pressure by blanking the unloader off, resulting in the unloader giving up completely!

Noun used with modifier

• boiler: Water cooled pump for obtaining 9 bar group pressure, boiler safety valve features anti-flood device that drains to the waste out.
• relief: The safety system is generally based on using high integrity safety relief valves.
• pop: Stephenson's link motion, an Ashford type steam reverser and Ross pop safety valves were fitted.