Knife Gate Valves - Quick Delivery

Hi

I am looking for a knife gate valve for a mining slurry application. I would like it within 4 weeks.
The delivery point is in New Zealand, but air freight is not a problem.

The size is 350NB, or 300NB would do if absolutely necessary. Pressure rating is 21bar. Operating pressure is normally around 17bar and the valve must be capable of opening against 21 bar differential pressure. Anticipated max flow is 420l/s. Natural rubber and stainless steel have proved suitable wetted materials for the slurry which is sulphide ore gold mine tailings D50 = 60 micron. An air actuator 5-10bar min/max pressure is suitable and it would be and advantage for this to be supplied with the valve. I prefer to use the actuator oil filled with separate air over oil accumulators to give smoother adjustable actuating speed. So actuator internals should be hydraulic oil compatible.

The valve will be used for dumping the tails line if there is a failure or planned shutdown so the duty is occasional but severe. Clarkson valves are believed to be of suitable quality and probably L&M valves also. Keystone fig955 valves only go to 16bar.

Local valve suppliers tell me that this valve would have to be manufactured which would take at least 6 weeks (ex USA). I would have thought there must be a reasonably priced "off the shelf" supplier somewhere.

Can anyone help source a good supplier?

Cheers

Steve McKenzie

[Non-text portions of this message have been removed] Received on Wed Nov 21 22:52:00 2001