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ML6874 

Valve Actuator 

PRODUCT DATA 

GENERAL 

The ML6874 is a self-contained, self-adjusting, 
linear motorized linkage that mounts directly 
onto V5011 two-way  or V5013 three-way valves 
and provides up to 19 mm (3/4") of linear travel 
(stem lift).  For use with low voltage 3-wire SPDT 
Series 20 (on-off) or Series 60 (floating) controllers. 

FEATURES 

•  Allows the use of one common transformer 

power supply for multiple actuators and 
controllers 

•  Self-contained, motorized valve linkage 

•  Linkage self-adjusts to valve stroke of up to 

19mm (3/4") 

•  Multipose mounting 

•  Strong valve seat closing  force 710 Newton 

(160 lbs.) 

•  Compact size for easy installation in 

confined area 

•  Field-configurable DIP switches for 

Direct/Reverse action 

•  One device for either Vac or Vdc power 

supply application 

•  Electronic current sensing provides internal 

protection and positive full closing force 

•  Field-addable auxiliary switches available 

Contents 

Specifications..........................................2 
Order information................................... 2 
Installation.............................................. 3 
Wiring Schematics..................................5 
Operation and Checkout.........................6 

PCY 02/98 

©  Honeywell Ltd. 1998  Printed in Canada 

95C-10865 

Summary of Contents for ML6874

Page 1: ... Self contained motorized valve linkage Linkage self adjusts to valve stroke of up to 19mm 3 4 Multipose mounting Strong valve seat closing force 710 Newton 160 lbs Compact size for easy installation in confined area Field configurable DIP switches for Direct Reverse action One device for either Vac or Vdc power supply application Electronic current sensing provides internal protection and positiv...

Page 2: ...s for 3 4 stroke Closing Force 710N 160 lbs Nominal Rating applies to both directions Performance Specifications Life Expectancy at rated load and power conditions 50 000 full stroke cycles plus 1 000 000 repositions at 10 stem travel or 10 years whichever occurs first Note rapid cycling repositioning will result in reduced service life of the actuator Ordering Information When purchasing replacem...

Page 3: ...ion The button itself is not needed 4 Slide the position indicator plastic disk or rubber O ring over the valve stem See inset Fig 3 Indicator will self align to the marking on the yoke after one complete operating cycle Assembly of ML6874 to the valve 1 The drive shaft of the ML6874 has a threaded hole to link with the valve stem Slide the yoke over the valve bonnet Fig 4 2 Thread the ML6874 driv...

Page 4: ...of set screw both are included in the plastic bag into the top of the shaft slotted Hexed side up Or use the set screw from the valve stem button 6 Depending on which type of set screw was used with a 5 mm 3 16 Slotted screwdriver or 1 8 x 6 Allen wrench included in the plastic bag tighten the set screw to lock valve stem in place Fig 6 WARNING g FIG 5 U BOLT ASSEMBLY 4 FIG 4 ASSEMBLY OF ML6874A T...

Page 5: ...g of the transformer is not exceeded and proper phasing is observed Use configuration DIP switches to select device functions Direct acting function actuator stem moves upwards with R B closed or Reverse acting function actuator stem moves downwards with R B closed DO NOT reverse wiring SPDT controller can be a low voltage Series 20 on off or Series 60 floating center off type Configuration FUNCTI...

Page 6: ...onfigured with the DIP switches which are located beside the terminal block see wiring diagrams for details Turn power off before setting the DIP switches 2 There is a short delay in actuator response upon every signal change It is to screen any unwanted incoming signals 3 For proper operation voltage on the T5 T6 must not be less than 22Vac or 24Vdc during running or force generating stages REPLA...

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