·Lubricator mounts on the gate valve outlet flange. With the lubricator holding the pressure, the gate valve can be opened, allowing the VR plug to pass through the valve and be threaded into the head or spool outlet;
·All studded and flanged outlets on casing heads.casing spools, and tubing heads are threaded to accept VR plugs. VR adapters are available for threaded outlets;
·For outlet working pressures of 15,000psi and above, straight thread, metal to metal seal VR plugs are standard. For lower working pressures, tapered thread VR plugs are standard.