Overview Feature

• Fully Welded Body

• Anti-static Design

• Anti-blowout Stem

• Cavity Pressure Self Relief

• Double Block and Bleed (DBB)

• Fire Safe to API 607

• Underground & Extended Stem option

• Low emission packing

• Emergency sealant injection

Design & Manufacture: API 6D

Face to Face: API B16.10, API 6D, EN 558

End Connection: ASME B16.5, ASME B16.25, EN 1092, GOST 12815

Test and Inspection: API 6D, EN 12266, API 598

District heating: power plants, heat exchanger station, underground pipeline, hot-water loop, stem pipe system

Steel plants: various fluid pipelines, exhaust gas selection pipelines, gas and heat supply pipelines, fuel supply pipelines

Natural gas : underground pipeline

Double block&bleed(DBB)

When ball is full open or close position,the transmitter substance in center cavity of body can be released by drainage and emptying devices.In addition,the over loaded pressure in the center cavity of valve can be  released to low pressure end by self relief seat.

Emergency sealing

Compound injection holes are designed and compound injection valves are installed at locations of stem/cap and body support of side valve.When sealing of stem or seat is damaged to induce leakage,the compound can be used to do the second time sealing.A concealed check valve is installed in side of each compound injection valve to prevent compound from out flowing due to the action of transmitter substance.The top of the compound injection valve is the connector for fast connection with compound injection gun.

NSEN strictly follow the free repair, free replacement and free return services within 18 months after the valve is ex-works or 12 months after being installed and used on the pipeline after ex-works (upon which comes first). 

In the case the valve gets failed due to the quality problem during the use in the pipeline within the quality warranty period, NSEN will provide free quality warranty service. The service shall not be ended until the failure is surely made settled and the valve normally workable as well as the client signs the letter of confirmation.

After expiration of the said period, NSEN guarantees to provide the users with on-time quality technical services whenever the product needs to be repaired and maintained.