A patient support isprovided. The patient support may includea plurality of inflatable membersthat raise or lower portions of the patientsupport based on the status of avalve assembly. The patient supportmay also include a plurality of inflatablemembers positioned at a foot endof the patient support to support lowerlegs of a patient including their heels.Another valve assembly is provided tocontrol a bleed rate of air from the healbladders.