亚洲人午夜射精精品日韩,国产午夜精品一区二区三区四区,欧美丰满熟妇BBB久久久,亚洲日韩一区精品射精,国产国产裸模裸模私拍视频,国产一级二级在线,邪太污污动态图,我和漂亮邻居少妇偷晴,性-交-乱一乱一视一频

ENCH
Product Center
DQB ventilating butterfly valve
Product Introduction

DQB 通風蝶閥.jpg

·Adoption of central stem disc structure, with small flow resistance and large flow capacity
·Suitable for low pressure differential and high flow situations
·Designed for carbon black condition to prevent the phenomenon of stuck or crystallization of granular media

Product parameters

Nominal diameter: DN 50~DN 2500
Nominal pressure: PN 2.5、6、10
Flow characteristic:similar equal percentage
Operating temperature:-40℃~650 ℃
Connection type: flange、clip
Actuator:pneumatic piston actuator、electric actuator

400-800-1819
15035138842@163.com