Valves conform to BS5163, and also meet ANSI/AWWA C509-87 standards for resilient seated gate valve. The valves are straight through bore without sealing groove and absence of body seat so it improves the characteristic of fluids and reduces the pressure loss in pipeline. The valves are suitable for using on pipelines of water sewage, neutral oil and gas as opening and closing devices for PN10/ PN16, at working temperature up to 70 degrees centigrade