Types of butterfly Valve
Types of butterfly Valve
(OP)
There are several types of butterfly valve, lug type, single flanged type, double flanged type, wafer type.
The questions are as follows.
1. When do you use lug type?
2. When do you use wafer type?
3. When do you use single flanged type?
4. When do you use double flanged type?
The questions are as follows.
1. When do you use lug type?
2. When do you use wafer type?
3. When do you use single flanged type?
4. When do you use double flanged type?





RE: Types of butterfly Valve
I choose lug type when I want to be able to loosen one side of the valve and maintain a seal on the other side.
I choose wafer style if I don't need the option to be able to remove one side, or if budget demands it.
I have never used single or double flanged butterfly valves.
Regards
StoneCold
RE: Types of butterfly Valve
We use wafer when trying to reduce costs, and when the client allows.
We use double flanged on all other applications. It is our norm to flange all valves.
I have yet to specify a lug type, or single flange.
RE: Types of butterfly Valve
In waterworks service, they have butterfly valves with long or short body. The difference being that the short body can't be opened when bolted up to a blind flange- it extends beyond the flange faces when opened.
RE: Types of butterfly Valve
Just wondering, what's the case with the blind flange downstream a butterfly valve - and why do you need to open the disc towards a blind flange? (thus using long body) -I'm no waterworker, so it may be something here.
RE: Types of butterfly Valve
RE: Types of butterfly Valve
RE: Types of butterfly Valve
It is very painfull to have to throw away a million dollar vessel because the thread the valves was supposed to attach to was damaged by a grain of sand or a stupid worker and now you can no longer seal it.
RE: Types of butterfly Valve
I would try to replace the damaged nozzle, or add another nozzle to the million dollar vessel, before throwing it away.
Threads get stripped, seize up, damaged.