ISO 6002-2021 pdf download.Industrial valves – Bolted bonnet steel gate valves. 5.4 Stem 5.4.1 The actual stem diameter shall take into account the valve design details and the stem material strength characteristics. The stem strength shall be considered when calculating the maximum input force from the handwheel and gearbox (if equipped) or shall be in accordance with the maximum rim pull when specified by the purchaser. 5.4.2 Stems shall have a gate attachment means at one end and an external trapezoidal style thread form at the other end. 5.4.3 The stem shall be one-piece wrought material. Welded fabrication is not permitted. 5.4.4 The stem end that connects to a gate shall he in the form of a T’ except that for a double disc gate, the end connection may be threaded. 5.4.5 The stem connection shall be designed to prevent the stem from turning or from becoming disengaged from the gate while the valve is in service. 5.4.6 The stem design shall be such that the strength of the stem-to-gate connection and the part of the stem within the valve pressure boundary shall, under axial load, exceed the strength of the stem at the root of the operating thread. 5.4.7 The one-piece stem shall include a conical or spherical raised surface that seats against the bonnet backseat when the gate is at its full open position. It is required to have a stem-bonnet backseat and, as such, is not meant to imply a manufacturer’s recommendation of its use for the purpose of adding or replacing packing while the valve is under pressure. 5.5 Auxiliary connections 5.5.1 Provision for auxiliary connections is not required unless specified in the purchased order. 5.5.2 Auxiliary connections shall be identified as indicated in Figure 4. Each of the 11 locations is designated by a letter.ISO 6002 pdf download.
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