OTECO Pressure Relief Valve Shear Pin

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The pressure at which the valve operates is determined by the force required to shear a pin or pins installed through the bonnet or bushing and the valve stem in single or double shear configuration. Warning – The Oteco, Inc. pressure valve is NOT designed for applications which demand precise setting of the relief pressure. The pressures indicated on the valve nameplate are nominal values. The actual pressure at which the valve operates may vary from the nominal pressure. Early versions of valves of this design utilized common steel nails as shear pins. Although nails may have been satisfactory in years past, common nails currently on the market come from a wide range of sources, both domestic and foreign, and exhibit loose dimensional tolerances and a wide variation in material properties. Consequently, relief pressures obtained with nails are no longer sufficiently predictable. To ensure predictable and consistent relief pressures, shear pins of Oteco, Inc. manufacture are carefully controlled both in material properties and in dimension. Shear pins manufactured by Oteco, Inc. are colored coded as follows: OTECO, Inc. Pin No. Color Code 60 ORANGE 50 BLACK 45 SILVER 40 GREEN 30 GREY 20 RED 16 BLUE 12 WHITE 8 PURPLE 6 YELLOW 4 PINK 3 BROWN The nominal relief pressures listed on the valve nameplate have been determined by testing in the Oteco, Inc. laboratory, and are valid when the specified genuine Oteco, Inc. shear pin is installed. The actual pressure at which the valve operates will vary, due to a number of factors. In the absence of pressure pulsation, relief pressures can be expected to fall within limits which are generally acceptable in the applications for which the valve is intended. When exposed to excessive pressure pulsation, the valve may operate at a pressure significantly below nominal relief pressure, due to fatigue of the shear pin. WARNING – Personnel must be alert to the possibility of unexpected operation of the pressure relief valve due to fatigue of the shear pin. Never place yourself in a position in which you may be exposed to bodily injury if the valve operates. Unless you have personally verified that the appropriate block valves or pump controls have been tagged and locked and that all pressure has been bled from the valve inlet port, you cannot safely assume that the valve cannot operate.