该阀采用环空外压操作测试阀的开关，不需要保压，而且采用简单的机械压力平衡机构代替了专用计量套。
Without keeping annulus pressure to static and instead of special metering by simple mechanical pressure ba lance structure, this valve is conducted by annulus pressure.
由于传统砂浆用于加气混凝土抹灰时，存在保水性差、粘结强度低、易开裂空鼓等缺陷，这严重阻碍了加气混凝土的广泛应用。
Defects of bad water retention, low bonding strength, easy cracking and bulging seriously impede extensive application of aerated concrete when common mortar is used for plastering aerated concrete.
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