MarkWest Energy (MWE 0.7%) is downgraded to Hold from Buy at Stifel, which believes MWE’s current valuation fairly reflects forecast utilization increases and DPU growth over the next couple of years. When comparing on an EV/consensus 2015 EBITDA estimate basis,fiberglass mustang doors, MWE is trading at 15.5x vs. a peer average of 14.2x; if a calculation includes Class B units, which convert over the next three years,fiberglass sliding doors, MWE’s multiple increases to 16.3x. Also, MWE’s current yield is 4.4%, compared to its peer group of 5.1%. Wunderlich says wells in the Marcellus and Utica continue to show improvement and have raised the operating outlook for E companies in the region; MWE,fiberglass sound insulation, with its dominating position in the plays and a chain of organic expansion projects in the pipeline, would be a direct beneficiary to the rising production. The firm also notes that MWE is adding another 400M cf/day of processing and 60M bbl/day of fractionation capacity at its Keystone complex.Rex Energy, MarkWest reach deal to increase gas processingRex Energy (NASDAQ:REXX) says it has signed agreements with MarkWest Energy (NYSE:MWE) that will expand its natural gas processing capacity in Butler County, Pa. Rex says its processing capacity will rise to at least 280M cf/day of gas by the end of 2015 with MWE’s Bluestone III facility,lowes exterior doors fiberglass 21, and 405M cf/day by the middle of 2016 with Bluestone IV; MWE is in the middle of constructing both facilities. Rex says the recently announced acquisition of Pennsylvania and Ohio acreage from Shell will significantly expand the Butler operated area,foil backed fiberglass insulation,fiberglass front door with sidelights 51, and the partnership with MWE will support its growth through increased processing and fractionation capacity.Summit picks up 40% stake in Ohio Gathering for $377MSummit Midstream Partners (SMLP) exercises its option to pay $377M to buy a 40% equity stake in Ohio Gathering Co. and Ohio Condensate Co. from affiliates of MarkWest Energy (MWE) and The Energy Minerals Group. Ohio Gathering is now gathering 181M cf/day under long term, fee based agreements,lowes fiberglass entry doors 23,prehung fiberglass exterior doors, and SMLP, MWE and EMG expect to develop more than $3B of natural gas gathering and condensate stabilization infrastructure for its customers through the joint venture.MarkWest reroutes natural gas from damaged Pennsylvania facilityMarkWest Energy Partners (MWE 0.4%) says it is assessing the damage at a natural gas processing plant in Pennsylvania after an apparent lightning strike and is working with customers to reroute some of their gas to another location. The Houston, Pa., complex consists of three processing plants totaling 355M cf/day of capacity and 98K bbl/day of ethane and other natural gas liquids. Range Resources (RRC +1.7%) says some of its wells in the area are shut in while the plant is down but expects minimal impact to its Q2 production; RRC maintains Q2 production guidance of 1,065M 1,075M cfe/day.