A method for servicing a subterranean wellbore extending through a formation, the method comprising the steps of: a) positioning at a downhole location a sliding sleeve valve device, the device having an inner sleeve defining a longitudinal passageway therethrough, the inner sleeve positioned in, and stationary with respect to, a generally tubular housing, and a first sliding sleeve and a second sliding sleeve positioned for sliding movement in an annular space between the inner sleeve and housing; b) flowing fluid through the device passageway; c) positioning a first ball on a ball seat defined in the inner sleeve; d) blocking fluid flow through the device passageway using the first ball; e) building a first differential pressure across the first ball; f) applying the first differential pressure, through a first pressure port extending through the wall of the inner sleeve, to a surface of the first sliding sleeve; g) slidingly moving the first sliding sleeve in response to the first differential pressure; h) opening radial housing ports through the housing by movement of the first sliding sleeve; i) flowing fluid through the housing ports from the device passageway to a wellbore annulus defined between the housing and the wellbore; j) positioning a second ball in the inner sleeve; k) blocking fluid flow through the device passageway using the second ball; l) building a second differential pressure across the second ball; m) applying the second differential pressure, through a second pressure port extending through the wall of the inner sleeve, to a surface of the second sliding sleeve; n) slidingly moving the second sliding sleeve in response to the second differential pressure; o) closing the radial housing ports by movement of the second sliding sleeve; and p) flowing fluid through the device passageway, characterised in that the method further comprising the step of equalizing pressure across the first sliding sleeve in response to step g). a) positioning at a downhole location a sliding sleeve valve device, the device having an inner sleeve defining a longitudinal passageway therethrough, the inner sleeve positioned in, and stationary with respect to, a generally tubular housing, and a first sliding sleeve and a second sliding sleeve positioned for sliding movement in an annular space between the inner sleeve and housing; b) flowing fluid through the device passageway; c) positioning a first ball on a ball seat defined in the inner sleeve; d) blocking fluid flow through the device passageway using the first ball; e) building a first differential pressure across the first ball; f) applying the first differential pressure, through a first pressure port extending through the wall of the inner sleeve, to a surface of the first sliding sleeve; g) slidingly moving the first sliding sleeve in response to the first differential pressure; h) opening radial housing ports through the housing by movement of the first sliding sleeve; i) flowing fluid through the housing ports from the device passageway to a wellbore annulus defined between the housing and the wellbore; j) positioning a second ball in the inner sleeve; k) blocking fluid flow through the device passageway using the second ball; l) building a second differential pressure across the second ball; m) applying the second differential pressure, through a second pressure port extending through the wall of the inner sleeve, to a surface of the second sliding sleeve; n) slidingly moving the second sliding sleeve in response to the second differential pressure; o) closing the radial housing ports by movement of the second sliding sleeve; and p) flowing fluid through the device passageway, characterised in that the method further comprising the step of equalizing pressure across the first sliding sleeve in response to step g).