GB/T 12222-2023 Multi-turn valve actuator attachments
1 ?Scope
This document specifies the requirements for the attachment of multi-turn or linear actuators to valves:
— flange dimensions necessary for the attachment of actuators to industrial valves [see Figure 1 a)] or to intermediate supports [see Figure 1 b)];
— those driving component dimensions of actuators which are necessary to attach them to the driven components;
— reference values for flange attachment dimensions and torque and thrust for flanges directly connected with industrial valves.
This document is applicable to the attachment dimensions of multi-turn actuators to valves.
Note 1: In this document, the term “valve” may also be understood to include “valve with an intermediate support” [see Figure 1 b)].
Note 2: A combination of a multi-turn actuator with integral multi-turn/linear gearbox supplied as an actuator is in accordance with this document, see Figures 1 a) and 1 b). When a combination of a multi-turn actuator and separate multi-turn/linear gearbox is coupled to form an actuator, the multi-turn attachment to the gearbox is in accordance with this document [see Figures 1 c) and 1 d)].?
a) ?Direct interface
b) ?Intermediate support interface
c) ?Combination of direct interface
d) ?Combination of intermediate support interface
Key:
1 — multi-turn/linear actuator;
2 — interface;
3 — valve;
4 — intermediate support;
5 — gearbox;
6 — interface;
7 — multi-turn actuator.
Figure 1 ?Interface between multi-turn/linear actuator and valve
2 ?Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 196 General purpose metric screw threads - Basic dimensions (GB/T 196-2003, ISO 724:1993, MOD)
3 ?Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
actuator
any device designed for attachment to a valve in order to provide for the operation of the valve
Note: The device is designed to operate using motive energy which may be electrical, pneumatic, hydraulic, manual, etc., or a combination of these. Movement is limited by travel, torque and/or thrust.
3.2
multi-turn actuator
actuator which transmits torque to the valve for at least one revolution and may be capable of withstanding thrust
Note: An actuator may be a combination of a multi-turn actuator and multi-turn gearbox.
3.3
linear actuator
actuator which transmits thrust to the valve for a defined linear stroke
Note: An linear actuator may be a combination of a multi-turn actuator and linear gearbox.
3.4
torque
turning moment transmitted through the mounting flanges and couplings
Note: Torque is expressed in newton-metres (N·m).
3.5
thrust
axial force transmitted through the mounting flanges and couplings
Note: Thrust is expressed in kilonewtons (kN).
3.6
flange type
it is represented by the letter F and a set of two or three digits (rounded off by dividing the value of d in Table 2 by 10)
4 ?Maximum torques and thrusts
The torque and thrust shall comply with the values listed in Table 1 which represent the maximum torques and thrusts which can be transmitted simultaneously through the mounting flanges and couplings.
The values specified in Table 1 have been defined on the basis of bolts in tension at a stress of 290MPa 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 and/or thrust values. See Annex A for an explanation on the calculation method.
The selection of flange size for a particular application should take account of additional torques and/or thrust that may be generated at the valve stem because of sizing, safety factors, inertia or other similar factors. Specifically, the torque and thrust generated at the maximum output torque and/or thrust of the selected actuator shall be calculated and considered in the selection of the flange along with the ability of the valve and actuator to withstand such torque and thrust forces.
Foreword
1 Scope
2 normative reference documents
3 Terminology and definitions
4 Maximum torque and maximum thrust
5 flange connection size
6 Flange code
7 Dimensions of the driven and driven parts
Appendix A (informative) calculation instructions
