IEC 60534-6-1:1997 pdf download.Industrial-process control valves – Part 6: Mounting details for attachment of positioners to control valves – Section 1: Positioner mounting on linear actuators
1 Scope and object
This section of IEC 60534-6 is intended to permit a variety of positioning devices, which
respond to a linear motion, to be mounted on the actuator of a control valve, either directly or
by employing an intermediate mounting bracket. This section is applicable where
interchangeability between actuators and positioners is desired.
The following parameters define the intended applicability of this section for the guidance of
manufacturers and users.
– The standardized mounting applies only to positioners which are mounted on the side of
the actuator.
– The standardized mounting applies in general only to actuators which have a travel from
1 0 mm through 1 00 mm.
– The standardized mounting is designed to cover three basic types of actuator designs
(see figure 1 ):
a) those with some form of cast or fabricated yoke to connect the actuator power unit to
the valve;
b) those which use some form of central tube yoke to connect the actuator power unit to
the valve;
c) those in which the yoke incorporates two or more columns or pillars to connect the
actuator power unit to the valve.
2 Definitions
For the purpose of this section of IEC 60534-6, the definitions given in the other parts of
IEC 60534 apply.
3 Basic design principles
The objective is to standardize the attachment of the positioner to the side of the actuator to
assure compatibility of products from different manufacturers.
3.1 For this purpose, the manufacturer of the actuator shall observe the design criteria
described in figures 1 through 4. Such criteria consist of one or more of the following
attachment means provided on the actuator yoke:
a) one or more suitable rib(s) with fixing hole(s) (see figure 1 e);
b) a plane surface allowing the mounting of the positioner by means of two or more of the
four outer threaded holes (see figure 2c);
c) a suitable shape allowing the fastening of the mounting plate by means of U-bolts as
indicated in figure 3c.
It is recommended that two means of the attachment of the same design be provided on both
sides of the yoke in order to allow the reversal of positioner mounting from one side to the
other side. However, if the actuator yoke can be turned by 1 80° without any change, then one
side only attachment means may be provided.
3.2 The design of the positioner mounting shall assure:
a) correct positioning of the positioner in relation to the actuator stem;
b) rigid mounting of the positioner.
3.3 The manufacturer of the positioner may design a positioner incorporating a means of
attachment compatible with this standard. Alternatively, a separate mounting plate may be
supplied which is compatible with the standardized mounting.
4 Feedback connection
In order to standardize the feedback attachment to the actuator, a connection piece shall be
provided which shall have four threaded holes tapped M6 surrounded with a bearing area of at
least 1 0 mm diameter for each hole (see figure 2). The remaining design of the feedback
attachment is not specified and may be designed to meet the requirements of each
manufacturer. If the design permits the connection piece to be rotated through 1 80°, only two
threaded holes, on one side only, need be provided.
The manufacturer of the positioner shall provide adequate means of transmitting the motion of
the actuator stem to the positioner by use of the above connection piece.
5 Mounting plate design
The positioner shall either incorporate the attachment means for the direct mounting or be provided with a mounting plate in accordance with the details given in figure 4. It should be noted that only the standardized details are given. Details such as material thickness to provide rigidity and design of mounting means of the positioner have not been standardized. The design of the mounting plate shall ensure sufficient contact with the rib or plane surface to ensure that the objective of 3.2b) is attained.
IEC 60534-6-1:1997 pdf download
