Product Specification

Forged Steel Material Spring Type Full lift safety valve for Water with Flanged Connection DN50 PN25

The primary function of a safety valve is to protect property and life.
Because a safety valve is often the last device to prevent catastrophic failure under pressure conditions, it is important that the valve works at all times i.e. it must be 100% reliable.
Safety valves should be installed wherever the maximum allowable working pressure of a system or pressure containing vessel is likely to be exceeded, in particular under fault conditions due to the failure of another piece of equipment in the system.
Pressure excess can be generated in a number of different ways including:

• Failure of a cooling system allowing vapour or fluid to expand
• Compressed air or electrical power failure to control instrumentation
• Plant fires
• During the start-up conditions of a plant

The term “Safety Valve” and “Relief Valve” are generic terms to describe a variety of pressure relief devices. A wide range is available based on the application and required performance criteria. The different designs are required to meet numerous national standards.

Components of a Safety Valve

Please note depending upon the manufacturer they may differ slightly to that shown below.

Definitions

ASME / ANSI PTC 25.3 standards (USA)

Pressure relief valve – (This is a general term, which includes safety valves, relief valves and safety relief valves.)
A spring-loaded pressure relief valve which is designed to open to relieve excess pressure and to reclose and prevent the further flow of fluid after normal conditions have been restored. It is characterised by a rapid-opening 'pop' action or by opening in a manner generally proportional to the increase in pressure over the opening pressure. It may be used for either compressible or incompressible fluids, depending on design, adjustment, or application.
Safety valve - A pressure relief valve actuated by inlet static pressure and characterised by rapid opening or pop action.
Relief valve - A pressure relief device actuated by inlet static pressure having a gradual lift generally proportional to the increase in pressure over opening pressure.
Safety relief valve - A pressure relief valve characterised by rapid opening or pop action, or by opening in proportion to the increase in pressure over the opening pressure, depending on the application, and which may be used either for liquid or compressible fluid.

European standard EN ISO 4126-1

Safety valve - A valve which automatically, without the assistance of any energy other than that of the fluid concerned, discharges a quantity of the fluid so as to prevent a predetermined safe pressure being exceeded, and which is designed to re-close and prevent further flow of fluid after normal pressure conditions of service have been restored.

Basic Safety Valve Principles

This diagram represents a Safety valve in its very simplest form. The force acting on the inlet side of the disk is acting against the force applied by the spring plus the force applied by the back pressure on the top of the disk.

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

1. Gate valve series
2. Ball valve series
3. Globe valve series
4. Check valve series
5. Butterfly valve series
6. 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.