Relief-valve
noun
1.
a device that, when actuated by static pressure above a predetermined level, opens in proportion to the excess above this level and reduces the pressure to it.
Compare safety valve (def 1).
Read Also:
- Relier  noun 1. a person or thing that relies. 
- Relies  verb (used without object), relied, relying. 1. to depend confidently; put trust in (usually followed by on or upon): You can rely on her work. verb (intransitive; foll by on or upon) -lies, -lying, -lied 1. to be dependent (on): he relies on his charm 2. to have trust or confidence (in): you can rely […] 
- Relievable  verb (used with object), relieved, relieving. 1. to ease or alleviate (pain, distress, anxiety, need, etc.). 2. to free from anxiety, fear, pain, etc. 3. to free from need, poverty, etc. 4. to bring effective aid to (a besieged town, military position, etc.). 5. to ease (a person) of any burden, wrong, or oppression, as […] 
- Relieve  verb (used with object), relieved, relieving. 1. to ease or alleviate (pain, distress, anxiety, need, etc.). 2. to free from anxiety, fear, pain, etc. 3. to free from need, poverty, etc. 4. to bring effective aid to (a besieged town, military position, etc.). 5. to ease (a person) of any burden, wrong, or oppression, as […] 
- Relieved  verb (used with object), relieved, relieving. 1. to ease or alleviate (pain, distress, anxiety, need, etc.). 2. to free from anxiety, fear, pain, etc. 3. to free from need, poverty, etc. 4. to bring effective aid to (a besieged town, military position, etc.). 5. to ease (a person) of any burden, wrong, or oppression, as […] 
