L-type bench valves installed upstream from hotplate are installed using stainless steel bellows in indoor gas project for residential consumers.

• 在居民用户室内燃气工程中采用不锈钢波纹管,安装L型灶前台式阀,通过波纹定尺管与灶具螺纹连接,解决了胶管脱落引发燃气泄漏的问题。