Body and Bonnet Connection

the body and bonnet of class 150-class 900 gate valves are usually connected with studs and nuts.And the body and bonnet of class 1500-class 2500 gate valves are usually of pressurized seal design.

Seat

the stem is of intergral forded design.The seat is usually forged steeel.The sealing surface of the seat is spray welded with hard alloy specified by the customer.Renewable thereaded seat is used for NPS ≤10 gate valves,and welded on seat can be also optional if being requested by the cstomer.Welded on seat is used for NPS≤10 carbon steel gate valves.For stainless steel gate valve,intergral seat is usually adopted ,or to weld hard alloy directly integrally.Threated or welded on seat is also optional for stainless steel gate valve is being requested by the customer.

Quality assurance system 
1.Sclerometer
2.Universeal material testing machine
3.High speed analyzer
4.Chemical test
5.Electric analysis scales
6.Nde mt (magnetic powder) inspection

NDE UT (ultasonic) inspection
NDE PT (penetrate) inspecion
PMI spectrum analysis
Hydraulic pressure test
Cryogenic ball valve test
Fire-safe test

Certification

• API-6D

• API-Q1

• API2014

• ISO 9001-2008

• ISO-TS-29001

• CE-PED

• API 607 Fire safe certificate

• API 6FA Fire safe certificate

• China national petroleum corporation approved vendor

• Shanghai high enterprise certificate


Our major products

• Gate valve series

• Ball valve series

• Globe valve series

• Check valve series

• Butterfly valve series

• Other valve series

Exporting is the dominant operation at Kaitai.In the process of KATA brand promotion and building up our distribution channels over the years and now has many satisfied and loyal customers.KATA is well recognized and its products are widely used in the oil and gas industry,power plant,boiler,metallurgy,pressure vessel,water supply and drainage and etc.