1)working principle:

the pump consists of two different type barrel, which connect with plunger. According to hydraulic feedback principle, when elevating the plunger, the pump will form the gas injection channels to start the injection process.

When descending the plunger, the downward force will decrease the friction between viscous oil and sucker rod, to avoid the falling of sucker rod

2) Material: barrel :#45 carbon steel

plunger #45 carbon steel

3) main parameters

-TYPE API SCP25-225/150TH API SCP30-275/175TH

-Nominal D(mm): 57.2/38.1 69.6/44.5

-Plunger length(mm): 914/900

-Barrel Length(mm/in) 3300-4500

-Thread of upper pipe 2 7/8 3 1/2

-Thread of down pipe 2 7/8 2 7/8

-Thread of sucker rod 3 /4 7/8

-Max OD(mm) 89.5 107

-Max available depth 2000 1600

-Clearance Code 1