ZFV LUG Butterfly Valve Pass The Hydro Inspection

- Jan 17, 2020-

Please see detail technical description for the LUG butterfly valve :

Size NPS 4’’, pressure 150LB, triple offset consturction disc , the valve is bare shaft with top flange with dimension as per ISO5211, customer will install pneumatic actuator by themself. The body material cast steel ASTM A216 WCB, disc material stainless steel AISI 316, stem stainless steel, seat material multilayer SS+graphite, bolting A193 B7&A194 2H.


The main norm include :

API609 for design and manufactured .

API609 Cat. B for face to face dimension

ANSI B16.5 for end flanges drilling dimension

API 598 for test and inspection

ASME B16.34 for temperature-pressure rate.


Paint for triple offset butterfly valve is applied accordance with customer’s request . prime paiting and finishing coating , with black color for finished painting. Since customer do not have request for thickness of paitn, the dry film thickness is about 250nm as per factory’s standard.

Coating color and thickness can also produced as per request.


The third part inspector observed the hydro testing procedure in factory, and result is acceptable as per API598: no visual leakage found during hydro testing and air testing.

Testing recording data as below : The shell testing pressure 3.0Mpa by water, the seat seal testing pressure is 2.2Mpa by water, and the air testing pressure is 0.6Mpa by air, duration 60s per each testing.

Valve function and painting tseted and result is acceptable.


ZFV ( Zhejiang zhengfeng valve co., ltd ) is a triple offset butterfly valve manufacturer in wenzhou city which named capital of valve and pump.  Our factory produce butterfly valve with standards include API, DIN, JIS. GOST, EN, ISO, GB and so on , provide vavious materials valve to meet different requirements of customer ver the world.


  4'' 150lb butterfly valve_副本  B0817BC9D6DFA94640D581EF22C7749B_副本

Zhejiang Zhengfeng Valve Co., Ltd