Emerson 289 Series Relief Valves / Backpressure Regulators- Manuals

289 Series 2 Principle of Operation Refer to Figures 2 and 4. The 289 Series Relief valves are to be installed (between large service regulators such as S202G or S302G Series) so the outlet is piped downstream to relieve excess pressure to the atmosphere. As inlet pressure increases, the spring is c...

289 Series 3 rain caps or elbow piping (see Figure 4), must be attached to the outlet to keep the relief valve from getting plugged or from collecting moisture, corrosive chemicals or other foreign materials. If piping is to be attached to the valve outlet, the following parts (if they are connected...

289 Series 4 removed. antiseizing sealant should be applied to the adjusting screw (key 6) threads on valves without closing caps. If set pressure adjustment is necessary, monitor the inlet pressure with a gauge during the adjustment procedure. Remove the closing cap (key 14) or loosen the hex nut (...