Задвижки чугунные, приводимые в действие ключом, для подземной эксплуатации
Название (англ.):
Predominantly key-operated cast iron gate valves for underground use
Описание (англ.):
Specifies requirements for two types of predominantly key-operated valves for underground use with flanges or spigot ends or socket ends. The two types shall be specified as type A or type B and shall include the following features: inside screw stem; wedgeor parallel obturator; metallic or elastomeric obturator seatings; metallic or elastomeric body seatings; ferrous metal and/or copper alloy trims; T-key operation; ring key and bar operation. Type A valves are for T-key operation; type B valves are for ring key and bar operation.