[FUN] Controlling On/Off FF Valves on H-1's

[Stephen Mitschke]

Can you please post an additional note to tell us if these are smallsolenoid type valves or larger valves with actuators? There are a number ofon/off valve actuators available from a variety of manufacturers.Alternately, DeltaV also support AS-i, which may be another option toconsider for this part of your application.Ian-------- original message ------We are in the latter stages of design on a large water treatment facilitythat is utilizing a large amount of FF Devices. In our micro-filtrationprocess there are a significant number of FF On/Off valves specified tocontrol that process, but it has not been specified as to how they willexist/execute their control on the H-1 segments. For an individualmicrofiltration tank, there are as many as 14 of these valves that wouldlogically want to exist on the same segment (if they could). I'd like to solicit opinions from users that utilize controlling on/offvalves on their H-1 segments, and see what hardware/configuration they havefound effective in accomplishing this. I wouldn't mind hearing the horrorstories either!! These will need to exist on a Delta V System in our case.I'm aware of the Smar DC-302 and another H-1 Smart Carrier, but I don't knowwhat else is out there, nor how effective either of those would be for ourfacility. Any input would be appreciated.Jay KalinowskiOrange County Water DistrictFountain Valley, Ca

[Stephen Mitschke]

The valves in question are mostly larger, not just solenoid types, actuatortypes ranging from 1 1/2" to 24" in valve size. As of now, one manufacturerbeing utilized is Tyco's Avid ZR-F discrete valve controller. It is listedon the Fieldbus website as being a certified device, but not on Delta V'slist of devices their system supports, so I have a call in to them as wellon that issue...Jay KalinowskiOrange County Water DistrictFountain Valley, Ca----- message 2 ------You may want to check out EIM Controls website at www.eim-co.com and lookat the "Multiple Protocols for Valve Actuator Connectivity". EIM hasinstallations with up to 25 actuators on individual H1 links with othermanufactures' transducers connected to Delta-V. However, FF may not be theright solution for your application in terms of cost, performance, andsecurity.Gerald EIM

[Stephen Mitschke]

We are using Topworx, Stonel, and Buswitch (Flowserve) on a variety ofquarter-turn actuated valves, up to 6" line size. They all seem to workfine. I think you can support 14 devices on a segment, depending on thepower consumption of the selected device, and the segment power conditioner(some put out more voltage than others).There has been an issue with some of the "piezo" (sp?) solenoids used inthese appliances; they can exhibit a "memory" if left in the energizedstate. We had some that wouldn't close (which was their spring-return failposition) until we shut off the instrument air. Make sure your supplier hasaddressed this problem, unless your valves never remain in the "energized"state for more than a few hours.John RezabekBP