Valve Material requirement of carbon steel, austenitic stainless steel, duplex stainless steel, 17/4 PH stainless steel, soft seat and seal material (Part 1)- Executed project-SGPK03
1.Carbon Steel and Impact Tested Carbon Steel
The chemical composition of carbon steel castings and forgings shall be limited as follows:
Carbon content 0.22% max
Carbon equivalent 0.43% max by ladle analysis where :
CEV = C + Mn/6 + (Cr+Mo+V)/5 +(Cu + Ni)/15
NACE MR0175 specified material shall also have limitations on chemical composition as follows :
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Generally speaking, the flow of globe vales is from down to up. It means the medium will go through from disc downside then out by upside. Globe valves usually adopt compulsory sealed design, so close valve by offer pressure to disc against seat. So if you want to open valve, the globe valve disc must overcome resistance made by stem and packing friction, medium pressure will offer adverse pressure which help open valve. It means you can use less force than closing valve. So the stem diameter should be larger, to avoid stem bending fault.(depends on metal material physical performance of stem ). In recent years, there are more and more valve pressure seal, the medium through upper disc to down disc, so the close valve force is smaller than the open valve force, valve shaft diameter are allowed to be smaller.
Continue reading “Flow direction of globe valve, down-to-up or up-to-down, Stem diameter?”
SGV updated it’s product: Wafer type Dual plate check valve
It has many ways of calling, Dual plate, Duo disc, Double disc, Double plate check valve, it is swing type, also a butterfly type check valve, spring loaded to help return quickly. It is a retainerless check valve, can be lug type, flanged type also. It has wide application by choose suitable material. Can be used for following industry, food, building, oil and gas, pipeline, chemical, petrochemical, waste water, transportation and so on.
More information, contact us
Marathon Petroleum Corp. (MPC) today announced it has signed a definitive agreement to purchase BP’s 451,000 barrel per calendar day (475,000 barrel per stream day) Texas City refinery, three intrastate NGL pipelines originating at the refinery, an allocation of BP’s Colonial Pipeline Company shipper history, four terminals, retail marketing contract assignments for approximately 1,200 branded sites and a 1,040 megawatt cogeneration (cogen) facility. The base purchase price is $598 million, plus inventories estimated at $1.2 billion. The agreement also contains an earnout provision under which MPC could pay up to an additional $700 million over six years, subject to certain conditions. The transaction is expected to be accretive to earnings in the first year of operation. Continue reading “Marathon Petroleum to Purchase BP’s Texas City Refinery – Valves”
Vacuum Gate Valve
Product Maintenance & Installation Manual
Sangong Flow Control Co.,Limited
This Vacuum valve is used for vacuum and minus pressure system and cooling water system of thermal power plant, as well as minus pressure cooling water systems of chemical, medicine industries, used as cut off and stop device.
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Vacuum Globe Valve
Sangong Flow Control Co.,Limited
Product Installation & Maintenance Manual
This vacuum valve is mainly used in heat-engine plant’s vacuum minus pressure and condensation system, Petrochemical, Pharmaceuticals and other industry’s negative pressure condensation system. as a open-close and separation device.
1. Pressure: PN10~100.0bar
2. Nominal diameter: DN10~DN150mm
4. Working Temperature: Carbon steel t≤425 ,alloy t≤530
Working principle and structure
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The gate valve, also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restriction is desired. The gate faces can form a wedge shape or they can be parallel. Gate valves are primarily used to permit or prevent the flow of liquids, but typical gate valves shouldn’t be used for regulating flow, unless they are specifically designed for that purpose. Because of their ability to cut through liquids, gate valves are often used in the petroleum industry. Continue reading “About Gate Valve”