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API 602 Forged Steel Check Valves(BS5352/MSS SP-118)

API 602, BS5352, MSS SP-118 Forged Steel Check Valves – Flanged, Flangeless, Threaded and Welding Ends

Forged steel check valves of Sangong are available in three bonnet designs.
The first design is the Bolted Bonnet, with male-female joint, spiral wound gasket, made in F304l/graphite. Ring joint gasket is available if required. The second design is in the welded bonnet, with a threaded and seal welded joint. On request a full penetration strength welded joint is available. The third design is the pressure seal bonnet, with a threaded and pressure seal bonnet joint.
The forged check valves are also available in three different design configurations. These are piston check valve type, ball check or swing check types. Besides, construction can be as follows:
1.Full port if required or conventional port, reduce port
2.Inside spring can be equipped if required
3. Disc can change for soft seal disc and ball disc.
4. Socket weld ends conform to ASME B16.11
Screwed ends(NPT) conform to ANSI/ASME B1.20.1
Butt-welded conform to ANSI B16.25
Flanged check valve ends conform to ANSI B16.5

Application standards
Design and manufacture as per:  API 602, BS5352, MSS SP-118
Test and inspection as per: API 598

API 602 – Compact Steel Gate, Globe, Check Valves – Flanged, Threaded, Welding, and Extended-Body Ends. The standard covers threaded-end, socket-welding-end, butt-welding-end, and flanged-end compact carbon steel valves in sizes NPS4 and smaller.

BS 5352 – Specification for steel wedge gate, globe and check valves 50 mm and smaller for the petroleum, petrochemical and allied industries

MSS SP-118 – Compact Steel Globe and Check Valves – Flanged, Flangeless, Threaded and Welding Ends (Chemical and Petroleum Refinery Service)

This MSS Standard Practice covers flanged end, threaded end, socked-welding end, and butt-welding end compact steel globe and check valves. The term “compact” is used to identify the valves covered by this Standard Practice as reduced seat port valves. Valve sizes correspond to nominal pipe sizes listed in ASME B36.10M and B36.19M. Flanged, flangeless, and butt weld end valves are limited to sizes NPS 4 and smaller; threaded and socked welding end valves are limited to sizes NPS 2 1/2 and smaller. Valves covered under this Standard Practice shall meet the requirements of ASME B16.34, “Standard Glass”.

API 598 Valve Inspection and Testing. The standard covers inspection, supplementary examination, and pressure test requirements for both resilient-seated and metal-to-metal seated gate, globe, plug, ball, check, and butterfly valves. Pertains to inspection by the purchaser and to any supplementary examinations the purchaser may require at the valve manufacturer’s plant.

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PDVSA Valves Suplier – Sangong Client

Venezuela PDVSA – Valves Suplier – Sangong

Petróleos de Venezuela is one important client of Sangong, as the state oil company of the Bolivarian Republic of Venezuela, PDVSA is responsible for the efficient, profitable, and reliable exploration, production, refining, transportation and trade in hydrocarbons.
The company is deeply committed to environmental protection and its main objectives include fostering the socio-economic development of Venezuela, guaranteeing sovereignty over its natural resources, and serving and benefiting the Venezuelan people.

Continue reading “PDVSA Valves Suplier – Sangong Client”

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Tilting disc swing check valve

The tilting-disc swing check valve is another variant of the basic type of check valve. In these valves, the disc swings partly through the seat. The geometry for sealing and avoiding jamming is more complicated than for other swing checks. One variety pivots the disc in the seat area – but somewhat off-center. This means that the zones around the pivot are more difficult to seal, analogous to the problem of the symmetrical butterfly valve. The disc is nearly balanced, reducing slamming. Seal material is basically Buna-N, but Viton, Teflon, and even monel are possible. The valve is a very short wafter type, so the open disc protrudes beyond the body.
Tilting-disc valves with the pivot outside the seating area are available in many forms. The geometry of the pivot location and angle of the seating surfaces allows the disc to lift away from the seat at all points and prevents the disc from becoming wedged so tightly in the seat that it cannot move. Extreme and sudden temperature changes and differentials get close consideration in this. The disc and seat may be likened to a slice from a bottle stopper, made at an oblique angle to the cone axis to allow the “stopper” to be removed by a twist about the pivot downstream. The machining of the oval seat ring and disc in this valve requires skill. In some instances, the cone is cut at right angles, but location of the pivot downstream and above the valve axis permits the top of the disc to swing through the seat.
In some tilting-disc check valves, the disc has a slight clearance on the pivot, to help assure a tight seat. In other tilting-disc vales, the heavy pivot shaft is rigidly attached to the disc and supported in close-clearance bearings. The pivot shaft is generally large-diameter in tilting-disc valves, so attachment of dashpots, indicators, and limit switches is easy.
Because of the partial balance of the disc, the fluid-dynamic characteristics of the disc are important. The forward-flowing fluid must open the disc easily, and then hold it open with little flutter. When flow slows and stops, the disc must close quickly and silently. Several tilting discs have curved undersurfaces to develop fluid-dynamic forces. One variety has a flap above the main disc, which also serves to limit disc opening, removing a load from the main disc.
Access to the internals of some tilting-disc check valves, when they are mounted in the line, is through conventional bonnets or removable plates. The internals of other models are inaccessible, because the valve body is of the wafer or short-spool type. In general, valves that must be welded into the line tend to resemble the standard types of checks, with welds at a safe distance from the seat. One line of tilting-disc checks has obliquely split bodies for pressure classes to 1500 ANSI, but is a wafer body between weld-end flanges in higher-pressure classes.
SGV Tilting Disc Check Valves consist of a cylindrical housing, with a pivoted circular disc. The pivots are located just above the center of the disc, and offset from the plane of the body seat. This design gives a bell-crank action to the disc. The seat is of circular bevel type and the disc drops in or out of contact without rubbing or sliding.It is mounted at the outlet pipeline of the pressurized output water pump in industrial (and urban) water supply and drainage system,high-rises, sewage discharge, hotel and restaurants, functioned to cut off the backflow of medium and eliminate destructive water hammer.
Featured by small volume, lightweight, Low head loss ,easy installation, Energy efficient, little occupation of space, saver if time and labor for servicing and maintenance, and etc., this valve is an optimal solution for water supply and drainage products

Contact Sangong for more information

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API 600 Bolted Bonnet Steel Gate Valves for Petroleum and Natural Gas Industries,ISO10434,BS1414 Gate valve

API 600 Bolted Bonnet Steel Gate Valves for Petroleum and Natural Gas Industries
API Standard 600, Eleventh Edition , October 2001
ISO 10434 Gate Valves: 1998 ( BS1414 Gate Valves)
ANSI/API Std 600-2001

Contents Included

Introduction, Scope, Normative references, Definitions, Pressure/temperature ratings, Design, Body wall thickness,Bonnet wall thickness , Body dimensions, Flanged, Butt-welding ends, Body seats, Openings, Bonnet dimensions, Bonnet-to-body joint, Gate, Yoke, Stem and stem nut, Packing and packing box, Bolting, Operation, Auxiliary connections, Materials, Materials other than trim materials, Trim, Repair, Testing, inspection and examination, Pressure tests, Shell test, Closure tightness test , Backseat test, Optional closure tightness test, Inspection, At the valve manufacturer’s factory, Other than at the valve manufacturer’s factory, Extent of inspection, Examination, Supplementary examination, Marking, Legibility, Body markings, Ring joint markings, Identification plate marking, Preparation for despatch

Bolted bonnet steel gate valves for petroleum and natural gas industries
1 Scope
This International Standard specifies the requirements for a heavy duty series of bolted bonnet steel gate valves for petroleum refinery and related applications where corrosion, erosion and other service conditions indicate a need for full port openings, heavy wall sections and extra large stem diameters.
This specification sets forth the requirements for the following gate valve features:
— bolted bonnet;
— outside screw and yoke;
— rising stems;
— non-rising handwheels;
— single or double gate;
— wedge or parallel seating;
— metallic seating surfaces;
— flanged or butt-welding ends.
It covers valves of the nominal sizes DN:
25; 32; 40; 50; 65; 80; 100; 150; 200; 250; 300; 350; 400; 450; 500; 600
and is applicable for pressure designations PN:
20; 50; 110; 150; 260; 420
when metric sized bolt holes are provided in end flanges and PN designations are marked on the valve body.
It also covers valves of the corresponding nominal pipe sizes NPS:
1; 11/4; 11/2; 2; 21/2; 3; 4; 6; 8; 10; 12; 14; 16; 18; 20; 24
and applies for equivalent nominal Class ratings:
150; 300; 600; 900; 1500; 2500
when inch-sized bolt holes are provided in end flanges and Class designations are marked on the valve body.It also covers additional marking requirements for valves that are PN (or Class) designated but have flanges drilled for inch (or metric) bolt holes.

2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International
Standard. At the time of the publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 7-1:1994,Pipe threads where pressure-tight joints are made on the threads—Part 1: Dimensions, tolerances and designation.
ISO 4200:1991,Plain end steel tubes, welded and seamless—Dimensions.                    ISO 5208:1993,Industrial valves—Pressure testing of valves.                                           ISO 5209:1977,General purpose industrial valves—Marking.

ISO 5210:1991,Industrial valves—Multi-turn valve actuator attachments.
ISO 5752:—1),Metal valves for use in flanged pipe systems—Face-to-face and centre-to-face dimensions.
ISO 6708:1995,Pipework components — Definition and selection of DN (nominal size).
ISO 7005-1:1992,Metallic flanges — Part 1: Steel flanges.
ISO 7268:1983,Pipe components — Definition of nominal pressure.
ASME B1.1:1989,Unified inch screw threads (UN and UNR thread form).
ASME B1.5:1988 (R1994),Acme screw threads.
ASME B1.8:1988 (R1994),Stub Acme screw threads.
ASME B1.12:1987 (R1992),Screw threads — Class 5 interference — Fit thread.
ASME B1.20.1:1983 (R1992),Pipe threads, general purpose (inch).
ASME B16.5:1996,Pipe flanges and flanged fittings.
ASME B16.34:1996,Valves — Flanged, threaded and welding end.
ASME B18.2.2:1987 (R1993),Square and hex nuts (inch series).
ASTM A193:1996,Specification for alloy steel and stainless steel bolting materials for high-temperature service.
ASTM A194:1996,Specification for carbon and alloy steel nuts for bolts for high-pressure and high-temperature service.
ASTM A307:1994,Specification for carbon steel bolts and studs, 60 000 psi tensile strength.
MSS SP-55:1985 (R1990),Quality standard for steel castings, visual surface examination.

API Standard 600/ISO 10434:1998  American Petroleum Institute———————————

If you have any quesiton or enquiry about API600 gate valves, feel free contact Sangong team with info@sangongvalve.com.   SGV also offer special API603 cast stainless steel gate valve.

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Válvula de balanço, API dupla flange Válvula de balanço, API flanged swing check valve

Nome do produto: Válvula de balanço (swing type check valve)

É geralmente apareceu com dupla flange da válvula de verificação do balanço, uma válvula de retenção tradicional, tem aplicação extremamente ampla. É simples e confiável, o que significa que a tecnologia é bastante maduro e estável, fácil de reparar. API válvula de swing e balanço DIN válvula adotar disco diferente pendurado estrutura.

Standard e escopo:

 Tamanho: NPS 2 “~ 36” DN50 ~ DN900
Avaliação da pressão: Classe 150 ~ 2500 PN2.5 ~ PN100
Conexão: face aumentado, Soldar, face Anel conjunta, face Masculino, Feminino rosto, solda de soquete e assim por diante
Material: aço carbono, aço inoxidável, liga e assim por diante
Projeto e Fabricação: ASME B16.34 e API 6D, BS EN 1868, DIN 3840
Inspeção e teste: API 598 ou API 6D, BS EN12569
Dimensão final flange: ASME B16.5 (NPS para ≤ 24); ASME B 16,47 série B (o nosso padrão normal), API 605 ou ASME B16.47 série A, MSS SP-44 (para NPS> 24; BS EN 1092 – 1
BW dimensão final: ASME B16.25
Soldadas-dimensão: ASME B16.11
De ponta a ponta: ASME B16.10, BS EN 558-1, DIN 3202, ISO 5752
TEMPERATURA E PRESSÃO: ASME B16.34
Dimensão da parede espessura: API 600 e BS 1868, API603 
Característica de projeto
Assento
Para o carbono válvula de retenção de aço swing, o assento é normalmente de aço forjado. A superfície de vedação da sede de pulverização é soldada com liga dura exigidas pelo cliente. Sede roscada renovável é usado para NPS ≤ 8 válvulas, e soldados no assento também pode ser opcional se a ser solicitado pelo cliente. Soldado no assento é usado para NPS ≥ 10 carbono válvulas de aço.

Para Válvula de aço inoxidável de verificação, assento integral é usualmente adotados, ou para soldar liga dura diretamente integralmente. Rosqueado ou soldada no lugar também é opcional para válvula de aço inoxidável de verificação, se necessário.

Corpo-a-Bonnet Conjunto: Junta
Aço inoxidável + de grafite flexível feridos é usado para Class150 e Class300 válvula de retenção; aço inoxidável + de grafite flexível feridos é usado para Class600 válvula de retenção, e junta conjunta também é opcional para Class600 válvula de retenção; junta anel comum é usado para Class900 válvula de retenção , projeto do selo de pressão é usado para Class1500 ~ Class2500 válvulas de retenção.

Conexão corpo e capota
O corpo ea capota de Class150 ~ Class900 válvulas de retenção são normalmente conectados com pregos e porcas. E o corpo e tampa de Class1500 ~ Class2500 válvulas de retenção são geralmente do projeto Selo de pressão.

Back to Manufacturer of Ball Valve,Gate Valve,Butterfly Valve,Check Valve,Special Valve, -China Sangong Flow Control

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Dual plate check valve – wafer or lug or flange type dual plate check valve

Check valves are automatic in operation and designed to prevent reversal of flow in fluid piping systems. So when the medium is back-going, valve disc will automatically close to avoid accidents. The check valves are maintained open by the flow of fluid in the forward direction and are closed by a spring force, or by the weight of the closing mechanism, or by back pressure of the fluid.

Dual plate check valve , one type check valve, typicaly see with wafer dual plate check valve, lug type dual plate check valve, flanged dual plate check valve, as per connection type, butt weld is very rare. It is also called split disc check valve, butterfly check valve(like a butterfly valve, this type valve has more similar structure with butterfly valve, compare with gate, globe, ball valve), duo disc spring loaded check valve(double disc with spring).

SGV offer dual plate check valve with stainless steel trim, usually CF8, CF8M, CF3,CF3M,(304, 316,304L,316L) Duplex steel, carbon steel disc is available but not suggested, Enconel spring, metal seating, is our noraml combination( with stem, spring, washer, gasket, hex nut and other necessary fittings).

It is designed to overcome the size and pressure drop limitations of the swing and disc type wafer check valves (somebody think dual plate is also swing type check valve ). It has many available types or modes so as to meet the generally complex and specific requirements, both in the industrial process and the daily life.

The disc(two plates)  of dual plate check valves are held against the seat by a torsion spring mounted on the hinge. And the external mounted retainer pins of valve are needed to hold the hinge in the centre of the flow path. Besides, an improved design secures the hinge internally and the valve mechanism is entirely sealed within the body so to prevent out leakages caused by retainer pin effectively.

Usually Applied Standard:

Design and manufacture: API594, API6D, JB/T8937.
Pressure-Temperature grade: ANSIB16,34, DIN2401, GB/T9124, HG20604, HG20605, SH3406, JB/T74, ANSI B16.34                                                                                             Length of structure (face to face,end to end): API594, API6D, DIN3202, JB/T8937             Inspection and test : API598, JB/T9092                                                                             Pipe flange:APIT605,ASMEB16.47,ANSIB16.5,DIN2543~2548,JB/T74~90,GB/T9112/9124, HG20592~20635, SH3406,  GB/T13042,