... have rising stems that are driven by a double threaded hub for quick opening and closing with minimum turning effort. The ... and fabric backed rings for high and low pressure sealings.Mud pump lines and Standpipe manifolds, Oil and gas pipelines, Sour ... services, Wellheads, Well treating chemicals.APPLICATION FOR THE GATE VALVEMud pump lines and Standpipe manifolds, Oil and gas pipelines, Sour ...