All valves to be suitable for double block and bleed service.

所有阀门需有双堵塞和双排放功能。

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The paper briefly summarized the current situation and advancement of double block copolymer as pigment dispersant for water-borne coatings.

简要概述双嵌段共聚物作为水性涂料用颜料分散剂的现状及进展。

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Product notes: We are developing a double block and bleed design seating arrangement for applications which require verifiable positive shut off.

产品说明：我们正在开发双重阻塞和排放结构的阀座排列设计，用于要求能够证明确实关断的应用环境。

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Motherwell were fired up early in the second half and only a double block denied Clarkson and Ross McCormack from close range.

BBC: Motherwell 0-2 Hearts

Caines drilled home from 12 yards just when visiting keeper Rikki Banks appeared to have saved his side with a double block from Aaron Farrell and Knights.

BBC: Harriers win through in FA Trophy

Almunia saved superbly from Wayne Rooney, denied Carlos Tevez with a double block and turned away Cristiano Ronaldo's header from six yards as United turned on the style in a dazzling first 45 minutes.

BBC: Man Utd 1-0 Arsenal