Tasking to look into a maintenance program for a computer centerCheck Valves water cooling pump system (water -> valve1 -> centrifugal pump -> valve2 -> cooling system). The Plug Valvessystem has two rising stem type gate valves and I need to be able to detail common failure modes and how these will be monitored. I don't have any more information than that sadly,and I'm a bit of a novice in relation to valves. (1) Gate valvesSafety Valves leak through the seats. Determine what the limit of acceptability will be for your seat leakage in your application. (2) Packing in gate valves wears rapidly if the valve is actuated much...you're dragging the full line diameter of the stem through the packing and putting a lot of miles on it. Again-how much leakage can you tolerate before the situation needs to be remediated. (3) protect them Safety Relief Valvesfrom freezing. Freezing will burst the bonnet and the valve will be destroyed and everything nearby will be flooded. Depending on the quality of fluid (such as untreated river water) and the valve material (such as carbon steel), it is certainly possible for gate valves to rust. This can either cause the Balance Valves valve to "stick" as Ashereng mentioned or for the disc to pull away from the [oooh, terrible bad senior moment!!: what is the piece called that connects the valve disc with the acuator? Oh yes...*] stem so that you think the valve is full open and it's not.

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