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Valve sealing surface/inner leakage and deposited welding material

We all know that there are three major factors that affect valve life:

1 valve inner leakage: The main problem is the quality of the sealing surface
2 valve outside leakage: The main problem is the quality of the casting, but also packing problem
3 valve structure: The main problems in the design and processing of pieces

Here we discuss only the inner steel middle high pressure valve leakage problem, the requiement of valve sealing surfaces.

Valve sealing surface, at a predetermined pressure, temperature, medium, installation location,  ensure safe and reliable seal; while in the manufacturing process, the sealing surface materials and structures, welding, machining, assembly and grinding process shoudl be good; sealing surface should also to be ease of maintenance, specifically requires the following: Continue reading “Valve sealing surface/inner leakage and deposited welding material”

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Classification of Valve

Valve Classsification

When design valve, selcect valve type, purchase valve, we need to know valve classfication first.

The first category
Automatic valve: to rely on the media (liquid, gas) own abilities and self-action of the valve. Such as check valves, safety valves, control valves, steam traps, valves, etc.

The second category
Actuated valves: With manual, electric, hydraulic, pneumatic valves to manipulate the action. Such as gate valves, globe valves, throttle valves, butterfly valves, ball valves, plug valves, etc. Continue reading “Classification of Valve”

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How to avoid crack when deopsite weld for valve sealing surface?

How to avoid crack when deopsite weld for valve sealing surface?

—Songong Valve

Many factory Welding Worker face potential crack  risk when deposite weld valve seat and disc, especially for those experience less fresh welding worker.This phenomen is more widely exsist for complicated workpieces when using easy-crack electrode.

Surfacing in the most commonly encountered problem is cracking, to prevent cracking of the main methods are:
1, preheat, interpass temperature control, slow cooling after welding.
2, stress relief heat treatment after welding. Continue reading “How to avoid crack when deopsite weld for valve sealing surface?”

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Valve Price Doesn’t Mean Everything

Usually many Distributor/Importer or Wholesaler of industrial valve, especially from third world country, they eveluate valve by several factor.1. price is most important  2. quality 3. after sales 4.delivery time  5. service 6. payment method… Other factors might change their rank, but price is most important for them.

Howover, we’d like to say Valve price doesn’t mean everything.  See below pic, we see this surprising pic in one factory when we visit their neighbour local recently.

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Wafer type Double Disc/Piston lift Check Valve-Installation, Operation and Maintenance Manual

Valve type
Wafer type check valve: double disc check valve, piston lift check valve

Usage and Feature
1. Usages
Series check valves are used in oilfield, chemical-industrial, power-station for checking the flow-backward of the material in the pipe.
2. Features

Type

Nominal

pressure

Strength testing  pressure

High-pressure

Sealing testing

Pressure

Low-pressure

Sealing testing

Pressure

Temperature

Range

Applicable medium

H2a3AR

1.6MPa

2.4Mpa

1.76MPa

Non

CC10

≤425°C

Water, oil

H3a3AR

2.5MPa

3.75MPa

2.75MPa

CA23

≤540°C

steam

H4a3AR

4.0MPa

6.0MPa

4.4MPa

H5a3AR

6.4MPa

9.6MPa

7.04MPa

CS34

≤316°C

150Lb

3.03 MPa

2.2MPa

300Lb

7.78MPa

5.78Mpa

≤425°C

Working theory and configuration direction
1. Series check valve are designed and made under standard API594 and JB/T7746, tested under standard API598,JB/T9092.
2. The disc opens under the pressure of the liquid, the liquid flow from the inlet to the outlet. Continue reading “Wafer type Double Disc/Piston lift Check Valve-Installation, Operation and Maintenance Manual”

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Globe Valve Installation,Operation and Maintenance Manual

Globe Valve Installation, Operation and Maintenance Manual

Valve type
Hand operated rising stem straight style globe valve

Usage and feature
Usage
Series flanged ends cast steel are used in oilfield, chemical-industrial, power-station for cutting and connecting the pipe.

Features

Nominal

pressure

Strength testing  pressure

High-pressure

Sealing testing

Pressure

Low-pressure

Sealing testing

Pressure

Temperature

Range

Applicable medium

1.6Mpa

2.4Mpa

1.76Mpa

Water, oil

150Lb

3.0Mpa

2.2Mpa

0.6Mpa

≤425°C

gas

300Lb

7.5Mpa

5.5Mpa

600Lb

15 Mpa

11 Mpa

Working theory and configuration direction
1. Series globe valve are designed and made under standard ASME16.34,JB/T7746, tested under standard API598,JB/T9092.
2. Hand wheel moving clockwise will close the disc and cut the pipe. As anti-clock will open the disc. Continue reading “Globe Valve Installation,Operation and Maintenance Manual”

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Ball Valves Installation, Operation And Maintenance Manual

Classification

The ball valves is divided into floating ball valve and trunnion ball valve according to the ball support in the bottom trunnion or seat.

The ball valves is divided into metal seal ball valve and soft seal ball valve according to the surface of sealing material.
The ball valves is divided into top entry, side entry and full welded body type according to the body structure.
The ball valves is divided into 1 pc, 2pcs, 3pcs body in side entry ball valve

Usage and feature
Usage
Series floating ball valve and trunnion type ball valve are used in oilfield, chemical-industrial, power-station for cutting and connecting the pipe.

Nominal

pressure

Strength testing  pressure

High-pressure

Sealing testing

Pressure

Low-pressure

Sealing testing

Pressure

Temperature

Range

Applicable medium

150Lb

3.0Mpa

2.2MPa

0.6MPa

≤180°C

Water ,oil, Gas

300Lb

7.5Mpa

5.5Mpa

600Lb

15.0Mpa

11.0Mpa

900Lb

22Mpa

17.6Mpa

1500Lb

37.5Mpa

27.5 Mpa

Working theory and configuration direction
1. Series gate valve are designed and made under standard API 6D tested under standard API598.
2. Handle moving clockwise by 90 will close the pore of ball is vertical of the pipe and cut it. As anti-clock will connect the pipe. Continue reading “Ball Valves Installation, Operation And Maintenance Manual”

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Butterfly Valve Specification

Valve Specification
Specified Valve Size Shall Be Equal To Nominal Pipe Size in ASME B36.10M
Pressure Test Pressure MPa (ASME B16.34)
Temperature Rating 600lb Body 15.51 Seat 11.374
Design Code BS 1873 And ASME B16.34
Body Material Carbon Steel
ASTM A216 WCB
Trim Material Trim: AISI 410, Sealing face: RPTFE/AISI 410
Bolting Bolt To ASTM A193 B7, Nut To ASTM A194 2H; Hot Dipped Galvanized To
BS729
End Connection 600lb RF Flange To ASME B16.5.
Temperature
Limitations -29~170℃
Valve Operation Handwheel
Body Construction Bolted Bonnet, Rising Stem
Outside Screw And Yoke
Trim Construction Butterfly Type Plug, Renewable Seat
Fire Tested To API 607/API 6FA(Providing Certificate)
Service Crude Oil
Notes: Packing Material:
Emission Free Material
Gasket Material
Manufacturer Standard
Additional Requirements:
See Specification
1. Face To Face Dimensions To BS 1873.
Short Pattern Valves Are Not Acceptable
2. Valves To Be Suitable For Full Vacuum.
3. Valves To Be Asbestos Free.
4 Inner Or Outer Leakage Is Not Acceptable
5. Valve design life is 20 years
Valve Check List
Approved Manufacturer Manufacturer Figure Number Nominal Size Range
2”-4”
Valve Type Globe Tag Number
GL-6A02
Piping Class 600

 

 

 

 

 

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VALVE TYPE SPECIFICATIONS/GEAR REQUIREMENT-ball,gate,globe,check,butterfly valve

VALVE TYPE SPECIFICATIONS

1 BALL VALVES
Ball valves shall be provided with the following:
• Lockable device (opened and closed).
• Blow-out proof stem.
• Split body design.
• Anti static device tested in accordance with ISO 17292 or API 6D as applicable.
• Trunnion mounted ball valves shall have a cavity relief seat.
• Suitable for bi-directional use.
• Ball shall be solid. Hollow ball is subject to MISC/MMHE approval.
• Ball position indicator.
Floating ball valves are acceptable up to 6” in class 150 and 300, 3” in class 600. Continue reading “VALVE TYPE SPECIFICATIONS/GEAR REQUIREMENT-ball,gate,globe,check,butterfly valve”

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fabricant de robinetterie industrielle et fournisseur leader en Chine

Au-delà de Valve – Sangong
Sangong Flow Control Co., Limited est l’une d’un fabricant de robinetterie industrielle et fournisseur leader en Chine, se concentrer sur la solution de flux offre intégrée pour les types d’application. Sangong est membre de la Chine soupape association. Sangong avoir plusieurs joint-venture usines accent sur ​​la fabrication de la vanne. Nos produits ont été servis dans de nombreuses industries et exportés à travers le monde telles que l’Asie, l’Europe, l’Amérique du Sud, Moyen-Orient, en Afrique et ainsi de suite.

Les produits de Sangong sont conçus et fabriqués dans le strict respect des normes telles que API, ANSI, DIN, BS, JIS, GOST, GB et ainsi de suite. Ses principaux produits sont les vannes, robinets à soupape, clapets, vannes à boisseau sphérique, vannes papillon, vannes à boisseau, filtre, soupape spéciale et contre brides, raccords et les principaux matériaux de vannes sont: WCB, WC1, WC6, WC9, C5, C12, LCB, LC3, CF8, CF8M, CF3, CF3M, A105, 304,304L, 316L, 316 et ainsi de suite; diamètres nominaux: DN 10 – 2400 et 1/2 “- 96” Tous les produits seront fabriqués selon ISO9001 système de gestion. Continue reading “fabricant de robinetterie industrielle et fournisseur leader en Chine”