Control Valve Station Design
Control Valve Station Design
(OP)
Dear Colleagues,
When the required body size of a control valve is lower than the inlet and outlet line size, inlet reducer and outlet expander are normally provided. Under what circumstances do we use eccentric reducer/expander? Likewise, under what circumstances do we use concentric reducer/expander? If eccentric type is required, under what circumstances do we use bottom flat orientation (or top flat orientation)? Are there any industry standards? Thanks in advance for your help.
When the required body size of a control valve is lower than the inlet and outlet line size, inlet reducer and outlet expander are normally provided. Under what circumstances do we use eccentric reducer/expander? Likewise, under what circumstances do we use concentric reducer/expander? If eccentric type is required, under what circumstances do we use bottom flat orientation (or top flat orientation)? Are there any industry standards? Thanks in advance for your help.





RE: Control Valve Station Design
One other trick: Insert a valve-length nipple between the upstream reducer and the valve. This is particularly helpful on wafer-style valves because it ensures that there will be room to install or extract the studs. I have seen cases where the reducer was installed against the valve on both sides and the studs hit the reducer before they could be threaded thru the flange.