2016年8月25日星期四

What is the anti-fire structural design of trunnion mounted ball valve?

Structural anti-fire design trunnion mounted ball valve is when the valve in the event of a fire in the use of the site, when non-metallic materials such as polytetrafluoroethylene seat seals, trunnion mounted ball valve stem seals, trunnion mounted ball valve stem seals and packing flange gasket decomposition or destruction at high temperatures, the trunnion mounted ball valve can be by means of a specially designed metal to metal secondary seal structure, effectively control valve leakage and leakage. Fire safety requirements for users of trunnion mounted ball valves, anti-fire design is according to meet APl 607 standard specifications.
Should you want to know more about ball valve from Reliable China valve manufacturer, please visit www.reliavalve.com or email us via sales@reliavalve.com.

2016年7月27日星期三

Trunnion mounted ball valve repair procedures and precautions step instructions

Trunnion mounted ball valve in the closed state, the internal body fluid under pressure is still there, before servicing and relieve line pressure valve in the open position.
1)The first trunnion mounted ball valve repair, disconnect the power or gas source, and the bracket from the actuator.
2)The new parts in the assembly need clean water, non-metallic parts should be cleaned immediately after removal from the cleaning agent, not a long soak.
3)After cleaning the wall needed to be to be washed after volatile cleaning agent (not soaked cleaning agent available silk rub) for assembly, but not for a long time on hold, otherwise it will rust, dust pollution.
4)We must first identify the trunnion mounted ball valve, after removing the pressure downstream pipeline has indeed to be demolished decomposition operation.
5)Care must be taken to prevent damage to the sealing surface of decomposition and re-assembly of the parts, especially when the non-metallic parts, O-rings should be taken when using special tools.
6)Using grease lubrication, grease should be compatible with both fixed ball of metal materials, rubber parts, plastic parts and the working medium, the working medium for the gas, can be used such as 221 special grease. Coated on the surface of the seal mounting groove of a thin layer of grease, spread a thin layer of grease on the rubber seals, valve stem sealing surface and the friction surface coated with a thin layer of grease.
7) Trunnion mounted ball valve assembly bolts on the flange must be symmetrical, gradually and evenly tightened.
8)Cleaning agents should be compatible with fixed ball in the rubber parts, plastic parts, metal parts and the working medium (such as gas) are working medium for the gas, available gasoline (API6D) to clean metal parts, non-metallic parts washed with pure water or alcohol.
9) Trunnion mounted ball valve down decomposition individual parts can dip way to clean, yet left down decomposition of non-metallic parts may be clean metal parts are impregnated with fine clean silk cleaning agents (to avoid fiber loss Adhesion On the part) scrub. It shall be attached to the wall to remove all grease, dirt, rubber, dust and so on.
Should you want to know more about ball valve from Reliable China valve manufacturer, please visit www.reliavalve.com or email us via sales@reliavalve.com.
Relate Products:

2016年7月9日星期六

Trunnion Ball Valves

Trunnion Ball Valve

Trunnion Ball Valves General Design
The ball is fixed by trunnion or trunnion support, and the seat rings are floating, free to move against the ball along the valve centerline. The trunnion/trunnion support together with bears adsorb the side load created by the pressure acting on the ball. At low pressure, the seat tight sealing is ensured by the preload of the springs acting on the seat rings. Along with the pressure increasing, the process medium pressure pushes the seat rings agains the ball to provide additional load for tight sealing.


The ball and stem are independent with each other to minimize the effect of the side thrust genrated by the pressure actiing on the ball.

Ball Seat Alignment
Mechanical stops are equiped on all valves to ensure the ball is never to be over rotated.

AED O-Ring
When valves are used under high pressure gas applications, e.g. hydrocarbon gas service under class 600 and above, the gas may be absorbed into the molecular structure of elastomeric O-rings. If the valve is subjected to sudden decompression, the O-rings may be destroed by the rapidly expanded gas. To avoid this possiblity, special AED O-rings or Lip seals, suitable for such service conditions. Are available on request.

Enviorenment Friendly Valve
Accurate maching of stem, gland and body sealing surfaces with double sealing (O-ring primary seal plus graphite gasket seal) ensure the low emission which is complying with the most servere pollution-control regulations. The test certificats are available on request.

Seat Design
Standard seat design is primary soft seal, and secondary metal to meal seal. Seat insert is designed as pressed-in type which is easy for maintenance. Optional design with primary metal to metal seal and secondary soft seal seat design is also available upon request.

a) Standard: Single Piston Effection Seats ( Self Relieving Seats)
 Medium pressure, both upstream and downstream, creates a resultandt trust to the seat rings against the ball to assure the tight sealing; Medium pressure action in the body cavity creates a resultant thrust to push the seat rings away from the ball.

The single piston design permits the automatic release of any over pressure in the body cavity when the valve is fully open or fully closed position.

b) Option 1: Double Piston Effect Seats
 Medium pressure, both upstream and downstream as well as in the body cavity, creates a resultant thrust that pushes the seat rings against the ball. Valves with double piston effect seat

rings require a cavity pressure relief device to reduce the build-up of over pressure in the body cavity.
c) Option 2: Combination Seats
Combination seats design is available on request. That is a stanadard seat design used for upstream side  and a double piston effect seats design used for downstream. The advantage is it can reach double piston effect seats design function without cavity pressure relief device to save the cost, meanwhile only need a little care to install valve per flow direction arrow.

When the ball is in the closed position, each seat seals off the process medium independently at the same time between the up/down stream and body cavity; it allows bleeding of the trapped cavity pressure (DBB) through drain or vent valve. The double block and bleed function makes it possible to flush the valve under pressure and verify that the seats are sealing properly.(Fig. 7)

Trunnion Mounted ball valves Blow-out Proof Stem
The stem is made separately from the ball with integral T-type round shoulder, retained by gland. (other designs are available on request).(Fig. 8)

Anti-static Device
Spring plus graphite type antis tatic device are applied between the ball, stem, gland flange and body, to keep the electrical continuity between all the metallic components, and ensure the resistance lower than the most severe service requirement.(Fig. 8)

Fire Safe
a) External leakage prevention All the possible external leakage point between stem and gland flange, gland flange and body, body and adapter are sealed with primary O-ring then secondary graphite gasket. When fire burned out the primary O-ring seal, the secondary graphite gasket seal still can prevent the process medium from external leakage.(Fig. 9)

b) Internal leakage prevention When fire burned out the primary O-ring seal between the floating seat ring and adapter, also the seat insert between seat ring and ball, the secondary graphite seal between seat ring and adapter, and seat ring & ball metal to metal contact preloaded by spring will minimize the internal process medium leakage. (Fig. 10, 11)



Emergency Sealant Injection System


Each valve of size 6” and larger (or smaller size on request), is equipped with sealant injection located at stem and seats area. The injection is integrated with check valve to provide backup sealing, also a check valve is equipped at front of seat sealant injection to avoid blowing out in case wrong operation. When the soft sealing materials (seat inserts and o-rings) are damaged and leakage happened by fire or other accident, the sealant can be injected through the injection fittings.(Fig. 12)

This is from:Trunnion Ball Valve

2016年7月5日星期二

difference between floating and trunnion mounted ball valve

Difference between floating and trunnion mounted ball valve

Starting from the float is floating and floating ball valve is floating, it is this attitude, usually starting with a small-caliber float, so the large-diameter ball type should be floating instead of Q47 Q41F

Two kinds of layout is not the same ball, the ball valve also has a floating lower floating shaft, valve switching process, the ball is around the vertical axis transformation, the sky is not the lower part of the float valve shaft. 200 caliber usually less use from the float valve, 200 caliber above are floating ball.

First, since the floating ball valve
The ball valve is floating from under medium pressure effect, the ball can occur and must be pressed in the displacement of the sealing surface of the outlet end, the outlet end of the guarantee seal.
From the float valve layout simple, good sealing, but the ball accepting jobs medium load all pass the exit ring seal and thus need to think about whether the information is maintained suffered job load media sphere. This layout is widely used in the low-pressure valve.

Second, floating ball valve
The ball valve is floating, the move does not occur after compression. floating ball valve with both starting floating valve seat, by the media pressure, moving the seat occurs, the seal is pressed onto the ball, in order to guarantee the seal. Usually with the ball, the lower shaft with bearings, operating torque is small, suitable for high pressure and large diameter valve.

To cut valve operating torque level and add reliable seal these years and presents the valve seals, both pressure injection of a special lubricant between the sealing surface to form a layer of film that enhances the seal, but also reduce operating torque , more suitable for large diameter high pressure valve.

2016年7月3日星期日

CF8M Trunnion Ball Valves, Class 600, 3 Inch

Short Description

China CF8M trunnion ball valves: CF8M body, Class 600 3 Inch, bolted Body, RF ends exported to South Africa, May 10, 2015.

CF8M Trunnion Ball Valves, Class 600, 3 Inch
  • Body: ASTM A351 CF8M
  • Trim: ASTM A182 F316
  • Seat: Nylon
  • Other: NACE MR 0175
  • Operation: Wrench
  • 2016年7月1日星期五

    Forged Steel Trunnion Mounted Ball Valves

    Descriptions
    China Forged Steel Trunnion Ball ValveManufacturer, Trunnion Mounted, Ball Valve, 3 Pc Body




    • Upstream sealing
    • Self relieving seat
    • Double block and bleed
    • Fire safe design, Anti-static device, Blow-out proof stem
    • Injection Port for seat & stem, Drain and Vent Ports
    • 3-Pc split body, Bolted Body

    Forged Steel Trunnion Mounted Ball Valves Drawings




    Forged Steel Trunnion Mounted Ball Valves Material List
    No.
    Part Name
    Carbon Steel
    Stainless Steel
    Stainless Steel
    1
    Body
    ASTM A105
    A182 F304
    A182 F316
    2
    Ball
    A105+ENP
    A182 F304
    A182 F316
    3
    Stud
    A193 B7
    A320 B8
    A320 B8M
    4
    Anti-fire packing
    Graphite
    Graphite
    Graphite
    5
    Seat
    PTFE/NYLON/PEEK/PPL/Delrin
    6
    Support ring
    A105+ENP
    A182 F304
    A182 F316
    7
    O-ring
    VITON
    VITON
    VITON
    8
    Spring
    17-7PH
    17-7PH
    17-7PH
    9
    O-ring
    VITON
    VITON
    VITON
    10
    Anti-fire gasket
    S.S+Graphite
    SS+Graphite
    SS+Graphite
    11
    Bonnet
    ASTM A105
    A182 F304
    A182 F316
    12
    Anti-static device
    Combined parts
    Combined parts
    Combined parts
    13
    Stem
    A182 F6a
    A182 F304
    A182 F316
    14
    Flat Key
    ANSI 1045
    ANSI 1045
    ANSI 1045
    15
    Thrust bearing
    PTFE
    PTFE
    PTFE
    16
    Sliding bearing
    Steel+PTFE
    Steel+PTFE
    Steel+PTFE
    17
    O-ring
    VITON
    VTION
    VTION
    18
    O-ring
    VITON
    VITON
    VITON
    19
    Anti-fire gasket
    S.S+Graphite
    SS+Graphite
    SS+Graphite
    20
    Seal gland
    A105+ENP
    A182 F304
    A182 F316
    21
    Cap screw
    A193 B7
    A320 B8
    A320 B8M
    22
    Packing
    Graphite
    Graphite
    Graphite
    23
    Connection plate
    ASTM A105
    A182 F304
    A182 F316
    24
    Screw
    A193 B7
    A320 B8
    A320 B8M
    25
    Pin
    ANSI 1035
    ANSI 1035
    ANSI 1035
    26
    Thrust bearing
    PTFE
    PTFE
    PTFE
    27
    Lower cover
    A105+ENP
    A182 F304
    A182 F316
    28
    Stud
    A193 B7
    A320 B8
    A320 B8M
    29
    Hexagon nut
    A194 2H
    A194 8
    A194 8M
    30
    Drainage valve
    Combined parts
    Combined parts
    Combined parts
    31
    Air release valve
    Combined parts
    Combined parts
    Combined parts
    32
    Sealant inject valve
    Combined parts
    Combined parts
    Combined parts
    33
    Check valve
    Combined parts
    Combined parts
    A194 8M
    34
    Hexagon nut
    A194 2H
    A194 8
    A194 8M

    Forged Steel Trunnion Mounted Ball Valves Material List
    No.
    Part Name
    Carbon Steel


    1
    Body
    ASTM A105
    A182 F304
    A182 F316
    2
    Bonnet
    ASTM A105
    A182 F304
    A182 F316
    3
    Ball
    A105+ENP
    A182 F304
    A182 F316
    4
    Stem
    A182 F6a
    17-4PH
    17-4PH
    5
    Seat
    PTFE/NYLON/PEEK/PPL/Delrin
    6
    Seat ring
    A105+ENP
    A182 F304
    A182 F316
    7
    Bearing holder
    A105+ENP
    A182 F304
    A182 F316
    8
    Seal gland
    A105+ENP
    A182 F304
    A182 F316
    9
    Packing
    Graphite
    Graphite
    Graphite
    10
    Connection plate
    ASTM A105
    A182 F304
    A182 F316
    11
    Pin
    ANSI 1035
    ANSI 1035
    ANSI 1035
    12
    Pin
    ANSI 1035
    ANSI 1035
    ANSI 1035
    13
    Flat key
    ANSI 1045
    ANSI 1045
    ANSI 1045
    14
    Thrust bearing
    PTFE
    PTFE
    PTFE
    15
    Thrust bearing
    PTFE
    PTFE
    PTFE
    16
    Sliding bearing
    Steel+PTFE
    Steel+PTFE
    Steel+PTFE
    17
    Spring
    17-7PH
    17-7PH
    17-7PH
    18
    O-ring
    VITON
    VITON
    VITON
    19
    O-ring
    VITON
    VITON
    VITON
    20
    O-ring
    VITON
    VITON
    VITON
    21
    O-ring
    VITON
    VITON
    VITON
    22
    Anti-fire packing
    Graphite
    Graphite
    Graphite
    23
    Stud
    A193 B7
    A320 B8
    A320 B8M
    24
    Hexagon nut
    A194 2H
    A194 8
    A194 8M
    25
    Screw
    A193 B7
    A320 B8
    A320 B8M
    26
    Screw
    A193 B7
    A320 B8
    A320 B8M
    27
    Injection valve
    Combined parts
    Combined parts
    Combined parts
    28
    Injection valve
    Combined parts
    Combined parts
    Combined parts
    29
    Check valve
    Combined parts
    Combined parts
    Combined parts
    30
    Air release valve
    Combined parts
    Combined parts
    Combined parts
    31
    Drain valve
    Combined parts
    Combined parts
    Combined parts
    32
    O-ring
    Combined parts
    Combined parts
    Combined parts
    33
    Anti-fire gasket
    ASTM A105
    A182 F304
    A182 F316

    Remarks:
    1. Select different materials for different working temperature and media.
    2. Trim materials and recommended service coverage referred to Appendix.


    Forged Steel Trunnion Mounted Ball Valves Standard
    • Design - API 6D/ASME B16.34
    • Face to Face - ASME B16.10/API 6D
    • End to End - ASME B16.10/API 6D
    • BW End - ASME B16.25
    • Test - API 598/BS 6755
    • Fire Safe Design - API 607/API 6FA
    • Special - NACE MR-01-75

    2016年6月30日星期四

    Cast Steel Trunnion Mounted Ball Valves

    Cast Steel Trunnion Mounted Ball Valves

    Cast Steel Trunnion Mounted Ball Valves
    • Upstream sealing, Self relieving seat
    • Double block and bleed
    • Fire safe design, Anti-static device, Blow-out proof stem
    • Injection Port for seat & stem, Drain and Vent Ports
    • 2-P or 3-Pc split body, Bolted Body
    Cast Steel Trunnion Mounted Ball Valves
    • Design - API 6D/ASME B16.34
    • Face to Face - ASME B16.10/API 6D
    • End to End - ASME B16.10/API 6D
    • BW End - ASME B16.25
    • Test - API 598/BS 6755
    • Fire Safe Design - API 607/API 6FA
    • Special - NACE MR-01-75

    Cast Steel Trunnion Ball Valves Drawing


    Material List of Cast Steel Trunnion Ball Valves
    No.
    Part Name
    Carbon Steel
    Stainless Steel
    1
    Body
    A216 WCB
    A351 CF8
    A351 CF8M
    2
    Bonnet
    A216 WCB
    A351 CF8
    A351 CF8M
    3
    Ball
    A105+ENP
    A182 F304
    A182 F304M
    4
    Anti-fire packing
    Graphite
    Graphite
    Graphite
    5
    Seat
    PTFE/NYLON/MOLON/PEEK/PPL
    6
    Seat support ring
    A105+ENP
    A182 F304
    A182 F304M
    7
    O-ring
    VITON
    VITON
    VITON
    8
    Spring
    17-7PH
    17-7PH
    17-7PH
    9
    O-ring
    VITON
    VITON
    VITON
    10
    Anti-fire gasket
    SS+Graphite
    SS+Graphite
    SS+Graphite
    11
    Hexagon nut
    A194 2H
    A194 8
    A194 8M
    12
    Sealant injection valve
    Combined parts
    Combined parts
    Combined parts
    13
    Check valve
    Combined parts
    Combined parts
    Combined parts
    14
    Air release valve
    Combined parts
    Combined parts
    Combined parts
    15
    Anti-static device
    Combined parts
    Combined parts
    Combined parts
    16
    Stud
    A193 B7
    A320 B8
    A320 B8M
    17
    Flat key
    ANSI 1905
    ANSI 1045
    ANSI 1045
    18
    Stem
    A182 F6a
    17-4PH
    17-4PH
    19
    Sliding bearing
    Steel+PTFE
    Steel+PTFE
    Steel+PTFE
    20
    Thrust bearing
    PTFE
    PTFE
    PTFE
    21
    O-ring
    VITON
    VITON
    VITON
    22
    O-ring
    VITON
    VITON
    VITON
    23
    Anti-fire gasket
    SS+Graphite
    SS+Graphite
    SS+Graphite
    24
    Seal gland
    A105+ENP
    A182 F304
    A182 F316
    25
    Screw
    A193 B7
    A320 B8
    A320 B8M
    26
    Packing
    Graphite
    Graphite
    Graphite
    27
    Packing gland
    A182 F6a
    A182 F6a
    A182 F6a
    28
    Lower cover
    A105+ENP
    A182 F304
    A182 F304
    29
    Stud
    A193 B7
    A320 B8
    A320 B8M
    30
    Hexagon nut
    A1942H
    A194 8
    A194 8M
    31
    Drain valve
    Combined parts
    Combined parts
    Combined parts

    Remarks
    • Body Material: WCB, LCB, LCC, CF8, CF8M, CF3, CF3M, MONEL etc. 
    • Seat Material: PTFE, Nylon, PEEK, PPL, Molon, Develon, Delrin, RPTFE 
    • O-ring Seals: NBR, Viton A, Viton AED, EPDM, Viton B 
    • Stem/Ball/Seat Ring: 304, A105+ENP, 17-4PH, 4140+ENP, 316, 304L, 316L, LF2+ENP, 13Cr/Hard Cr, F51 
    • End Connection - Flange Ends/Butt Welding Ends