Pig Signallers
Application
This is an omni trigger operated unit. The principle feature consists of a magnetic link between two packs of rare earth magnets.
The trigger is omni-directional and may also be actuated upwards as a plunger. When the trigger is actuated (very low torque is required) a follower mechanically moves a magnet pack axially in the signaller body. The magnet pack is strongly linked to a second magnet pack and shaft which move axially within an unpressurised housing.
The movement of the shaft operates a visual, manual reset flag or activates a limit-switch (auto-reset), giving a positive indication that a pig or sphere has passed the signaller.
The flag or switch may be set such that it can be seen from any given direction.
Models available | Direct mounted | Flange mounted | Valve mounted flange/direct |
---|---|---|---|
1. Electrical | EW | EF | EV-F / EV-W |
2. Mechanical | MW | MF | MV-F / MV-W |
3. Combined | CW | CF | CV-F / CV-W |
Specification
- Suitable for any pipe size from 3" norminal;
- Standard pressure range up to ANSI 900;
- Higher pressure range available to specification;
- NACE conformity;
- Principle feature of operation by rare earth magnets;
- Low-torque trigger;
- Internal moving parts stainless steel;
- All seals standard metric;
- 'O' rings viton unless otherwise specified.
Product guide
- The pig-sig. range is specifically designed, in concept and detail, to overcome the limitations of earlier signalling methods;
- The sensor probe (trigger) is omni-directional: it can neither damage pigs or spheres nor be damaged by their passage;
- Trigger has 100% free movement; therefore positioning of welding boss is unrestricted;
- Indicator flag is rotatable in 90° increments to obtain the most visible vantage;
- Available for use with foam and polly pigs;
- Positive action indicator flag is instantly reset;
- No moving seals, thus minimizing the possibility of product leakage from the pipeline;
- Simple concept - maintenance free;
- Easily adapted for existing welding connections to replace worn or defective units.