Valve, Valve Block, Manifold Block manufacturer / supplier in China, offering Professional Double-Acting Rubber-Energized Plastic-Faced Seal with O Ring for Mechanical Seal, Durable Double-Acting Rubber-Energized Plastic-Faced Seal with O Ring for Mechanical Seal, Durable Piston Seal PTFE Combination Double-Acting Rubber-Energized Plastic-Faced Seal for Mechanical Seal and so on.