ISO 5211 pdf download.Industrial valves — Part-turn actuator attachment
1 Scope
This European Standard specifies requirements for the attachment of part-turn actuators, with or without gearboxes, to industrial valves. The attachment of part-turn actuators to control valves is in accordance with the requirements of this standard only when subject to an agreement between the supplier and the purchaser. This standard specifies : – flange dimensions necessary for the attachment of part-turn actuators to industrial valves (see Figure 1a) or to intermediate supports (see Figure 1b) ; – driving component dimensions of part-turn actuators necessary to attach them to the driven components ; – reference values for torques for interfaces and for couplings having the dimensions specified in this standard. The attachment of the intermediate support to the valve is not the subject of this standard. NOTE 1 In this standard the term “valve” may also be understood to include “valve with an intermediate support” (see Figure 1). NOTE 2 When the part-turn actuator is a combination of a multi-turn actuator and a gearbox, the multi-turn actuator attachment to the gearbox should be in accordance with EN ISO 5210.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European standard only when incorporate in it by amendments or revision. For undated references, the latest edition of the publication referred to applies (including amendments). ISO 273, Fasteners – Clearance holes forbolts and screws. ISO/TR 773, Rectangularorsquare parallel keys and theircorresponding keyways (dimensions in millimetres).
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply : 3.1 actuator any power operated device used to operate a valve. The device is designed to operate using motive energy which may be electrical, pneumatic, hydraulic, etc., or a combination of these. Movement is limited by travel, torque or thrust 3.2 part-turn actuator actuator which transmits torque to the valve for a rotation of one revolution or less. It does not have to be capable of withstanding axial thrust 3.3 gearbox any mechanism designed to reduce the torque required to operate a valve 3.4 torque turning moment transmitted through the mounting flanges and connection components. It is expressed in Newton- metres (Nm)
4 Maximum flange torques
The maximum flange torque values listed in Table 1 give the maximum torques which can be transmitted through the mounting flange.The values specified in Table 1 have been defined on the basis of bolts in tension only at a stress of 290 MPa 1 and a coefficient of friction of 0,2 between the mounting interface. All variations in these defined parameters lead to variations of the transmittable torque values. The selection of flange types for a particular application should take into account the additional torques that may be generated because of inertia or other factors.
5 Flange dimensions
Flanges for part-turn actuator attachments shall comply with the dimensions shown in Figure 2 and given in Table 2. The method of attachment shall be by means of studs, screws or through bolting. When through bolting is used, the diameter of the clearance holes shall permit the use of bolts of a size given by the corresponding dimension d 4 in Table 2. Holes for the studs, screws or bolts shall be equi-spaced and positioned off-centre (see Figure 3 and Table 3), and shall conform to the requirements of ISO 273. The flange on the valve shall have a recess corresponding to the diameter d 2 ; a spigot on the part-turn actuator is optional. The minimum values for dimension h 2 apply to flanges having material of proof stress R p0,2 ? 200 MPa. Dimension d 1 has been calculated to provide sufficient seating for nuts and bolt heads. Such seating is defined as a radius from the bolt hole centre with the dimension (d 1 -d 3 ) / 2, and is a minimum. The flange shape and the design of the mounting surface of the valve and part-turn actuator outside these areas of seating is left to the choice of the manufacturer.