How is a relief valve attached to a cylinder?
The relief valve is enclosed within a cast iron casing that is secured to the cylinder head by threaded studs and hex nuts.
What are the features of a safety relief valve?
The standard design safety relief valveis spring loaded with an adjusting ring for obtaining the proper blowdownand is available with many optional accessories and design features. Refer to Figure 1 for cross-sectional views of typical valves.
What kind of seal does a pressure relief valve use?
Most commonly, pressure relief valves employ a spring loaded “poppet” valve as a valve element. The poppet includes an elastomeric seal or, in some high pressure designs a thermoplastic seal, which is configured to make a seal on a valve seat.
What kind of steel is a relief valve made of?
Often used in wet conditions and harsh environments, these valves have a 316 stainless steel body for excellent corrosion resistance.
Where is the cylinder relief valve on a ship?
On a ships main engine, the cylinder relief valve is located on the cylinder head. Its function is to protect the engine from over pressurization in the combustion chamber. It is normally set at 20% over the normal working pressure in the combustion area.
What are the components of a relief valve?
The relief valve is enclosed within a cast iron casing that is secured to the cylinder head by threaded studs and hex nuts. It consists of the following components;
What can cause a cylinder relief valve to lift?
However, there are situations that could lead to a relief valve lifting while engine is operating under normal load and conditions and warrant a full inspection. Faulty fuel pump or incorrectly set fuel injector delivering excessive fuel. Badly leaking fuel injector; through loose nozzle or enlarged injection holes.
What is the relief valve on a marine engine?
There are several valves on the cylinder heads of a marine diesel engine; the relief valve being one of these. The role and construction of the relief valve on marine engine cylinders is examined in the following sections. The first section gives an overview of a typical marine diesel cylinder head, including its valves and other components.