PyQt4: Create a custom dialog that returns parameters

I'm attempting to add a custom dialog box to my current GUI that can be launched for the user to set some parameters. Ideally, I would like to create the custom dialog using QtDesigner. Below is the code generated by pyuic4 from the QtDesigner ui code for the dialog box.

from PyQt4 import QtCore, QtGui

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(508, 300)
        self.buttonBox = QtGui.QDialogButtonBox(Dialog)
        self.buttonBox.setGeometry(QtCore.QRect(150, 250, 341, 32))
        self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
        self.buttonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
        self.buttonBox.setObjectName("buttonBox")
        self.label = QtGui.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(10, 120, 181, 31))
        font = QtGui.QFont()
        font.setPointSize(16)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.sl_value = QtGui.QSlider(Dialog)
        self.sl_value.setGeometry(QtCore.QRect(220, 120, 161, 31))
        self.sl_value.setOrientation(QtCore.Qt.Horizontal)
        self.sl_value.setObjectName("sl_value")
        self.ed_value = QtGui.QLineEdit(Dialog)
        self.ed_value.setGeometry(QtCore.QRect(400, 120, 41, 31))
        font = QtGui.QFont()
        font.setPointSize(16)
        self.ed_value.setFont(font)
        self.ed_value.setObjectName("ed_value")
        self.retranslateUi(Dialog)
        QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL("accepted()"), Dialog.accept)
        QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL("rejected()"), Dialog.reject)
        QtCore.QMetaObject.connectSlotsByName(Dialog)


    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.label.setText(QtGui.QApplication.translate("Di