Butterfly valve disc material for slurry service
Butterfly valve disc material for slurry service
(OP)
We are using butterfly valves to throttle limestone and calcium sulphate slurry flow in 4" and 6" pipes, not the ideal application for this type of valves I realize, but hey, we simply spend a couple hundred dollars every few months to change the discs and it has worked out OK for us. We are considering changing to, for example, pinch valves, but because of cost and the required piping changes we have not made the move yet. The original butterfly valves had CPVC or PVC discs, so all replacement discs I have ordered have also been PVC or CPVC. However, I've been told that if I switch to polypropilene discs we should get significantly more wear resistance, is that correct? Any suggestion for other disc materials, preferably as cost effective as CPVC or PPL for this type of applications?





RE: Butterfly valve disc material for slurry service
RE: Butterfly valve disc material for slurry service
a suggestion: try using a ball valve: a 'V' notch ball valve will give you good control.
RE: Butterfly valve disc material for slurry service
On slurry, Once the stuff chews thru the Cr, the 317 is pretty soft. Especially if the ball valve is controlling at small flows-then the V-Ball becomes a keyhole-ball when the v-notch wears thru at the point of the V.
AND, a ball valve costs many times more than an equivalent-size butterfly valve.
RE: Butterfly valve disc material for slurry service
RE: Butterfly valve disc material for slurry service
The gist of that thread was a "soft" pinch valve (some type of polymer, rubber, etc) was better at preventing erosion and abrasion than metal.
RE: Butterfly valve disc material for slurry service
Larry