11  September  2010

Established in 2000,  Xi'an Dongxin Petroleum Equipment Plant Co., Ltd is an integrated company en scientific research, design, production and services. It is a high-tech company which provides drilling equipments, tools and services.

Its plant is located on north of Lishan Mountain, Lintong Development Area.

It mainly produces gas and oil drilling tools and equipments. The main products includes various gas and oil wellhead, gas pipe safety guarding device, down hole safety guarding device in gas well, down hole choke holder of gas well, tri-functional automatic shut-off device of gas well, hydraulic dual OD driller stabilizer, high-pressure injection well head, various packers, blanking plug, ball injector valves, oil drainers, fishers and so on. In them, more than 10 products lead technological level in China, like gas well head device for replacing components under pressure, gas pipe safety guarding device, and driller tapered stabilizer, etc.

Tri-functional Automatic Shut-off Device for Gas Well
1.Introduction 
This product has the function of cutting off gas source automatically when gas pressure is higher or lower than rated pressure or when gas flow rate changes suddenly. The structure is new, the performance is reliable. It has following advantages:
—Large channel area, wide pressure adjustable range, no external power.
—Simple structure, reliable work.
—Easy installing, operation and maintenance.
2.Benefits
At present, product performance of the similar products made in China is not stable. While products imported form USA and Canada are very expensive. Compared with imported products, three functions safety guarantee unit for nature gas transportation pipeline is cheap and its performance is stable. It is significant to the safety of gas field development. 
3.Tech. Parameter
Designed Working Pressure: 34.5MPa
Connecting Flange Steel Ring Center Distance: 88.9mm
Make: GDL-34.5
Max guarding area: 100×104m3/d