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Ball Valve GGEV


GGEV Ball Valve

GGEV Model schedule illustration

Special requirement code: K—AntisulphurtypeD—Lowtemperature typeEX—Pole extending typeM—Ground buryingtype

Valve type code: Q-BallValve

Driving manner code: 3—Worm wheel and screw transmission6—Air driving7—Hydrodynamic driving8—Air—hydro operated9—Electric driving 9a—Explosion electric driving

Connecting type code: 1—The interior whorl joining2—The other whorl joining4—The flange joining6—To welding joining7—To inserting joining8—The caliper joining

Design feature code: 1—Direct floating type4—Floating typethree direct links of Model L5—Floating typethree direct links of Model T7—Direct regular type8—Regulartype Model T three direct links9—Regulartype Model L three direct links

Sealing formation code: Y—Hard alloyF—Strengthen the polytetrafluoroethylene (PTFE)N—NylonPPL—Counterpoint polyphenyl

Pressure grade code: The 10 times of the nominal pressure MPa, pound grade io practical number.

Body material code: C—WCB I—WC6, ZG1Cr5Mo V—WC9, ZG20CrMoV P—CF8, ZG1Cr18Ni9Ti R—CF8M, ZG1Cr18Ni12M02Ti S—CF3 L—CF3M F—LCB N—LC3

Note: this code is omitted with the carbon steel body of PN >= 2.5Mpa and the pressure class > Classl50.

 

 

Products Performance Specification

About the structure and working principle

I. Floating Ball Valve

  1. Indication of valve's open and close positions
    Ball, stem and handle are one assembly unit. The stem head is a flatsquare structure and the valve is easy to be seen either in the opened or closed position from the place the handle is in. When the handle or the flat—square of the stem head is parallel with the pipeline, the valve is in the fully opened position; while in the fully closed one when vertical to the pipeline.
  2. Locker:
    To prevent maloperation of the valve. a hanin lock can be used to lock it when in the fully opened or closed position. which is very important especially for the valve mounted outside or not allowed to be opened or closed by the technological flow.
  3. Stem fly—resisting structure
    The stem may be pushed out by the pressure in the middle cavity of the body when the medium goes through the valve. To prevent this, a fly-resisting structure is made on the lower part of the stem (Fig. 1). In this way, even if the packing and/or thrust bearing are burnt out in a fire or damaged by other causes, the medium's pressure inside of the body will have both stem flange and upper sealing face of body tightly contacted so as to prevent a lot of medium from leaking from the damaged packing place.
  4. Electrostatic—proof device and fire—fighting structure
    Both electrostatic—proof device (Fig. 2) and fire—fighting structure (Fig. 3) are designed. Once the seat ring is burnt out in case of a fire, the ball would be directly contacted with the metal face of the body so as to prevent a lot of medium from leaking from the burnt place of the
    img alt="" src="/assets/uploads/valve-series/ball-valve/floating-ball-valve-2.jpg" />
  5. Unique sealing structure of seat ring
    The dual—line seal (Fig. 4) and the self—combustible pressure dischargeable seat ring (Fig. 5) designed by way of combining the years ball valve manufacturing experience and the foreign advanced know—how can ensure the full seal under a high or low pressure and a vac
  6. Full or reduced diameter
    The valve flow aperture is identical to the inner diameter ofthe pipeline (which can be reduced one if so required by users) for the sake of cleaning (Fig. 6).

II. Fixed Ball Valve

  1. Block—up and excretion
    When the valve is in the closed state (Fig 7), the seat ring on the upstream and downstream sides cuts off the fluid and the accumulated matters in the middle cavity of the body can be excreted. The excreting device (Fig. 8) features the following functions:
    • Can check if the seat ring leaks or gets damaged beforehand.
    • Reduce pollution to the valve due to the medium replacement.
    • The packing on the stem portion can be replaced when the valve is in the fully opened or closed state underthe working pressure.
  2. Automatic pressure discharge
    When an abnormal pressure rise occurs with the medium stayed in the middle cavity of the valve due to rising temperature, the seat ring will come off from the ball and automatically discharge pressure (Fig. 9) or the safety valve mounted on the body ensures the system safety.
  3. Complete seal
    The unique sealing mode of the ball valve makes the fluid completely cutoff.
  4. Fire—fighting structure
    If the teflon seat ring is made softened and burnt in case of a fire or an abnormal temperature rise, the valve can be still reliably operated to prevent the fire from expanding and the seat ring's support can be contacted with the ball (Fig. 11) to act as an instantaneous seal, conforming with API607.
  5. Electrostatic—proof structure
    During valve operation, the friction between the ball and the PTFE seat ring will produce electrostatic charges and they will be accumulated onto the ball. To prevent electrostatic spark from being produced, an electrostatic—proof device (Fig. 12) is mounted on the valve, which can guide the charges out through the electric path formed by both ball and body via the spring.
  6. Emergent rescue of seal
    When the sealing parts of both seat ring (Fig. 13) and stem (Fig. 14) get damaged and thus leaks are caused, an instantaneous sealing action can be made available by injecting sealing grease through the grease injecting valve.
  7. Structure of seat ring
    Two kinds: single—seal (Fig. 15) and dual—seal (Fig. 16). In general, those of an automatic pressure discharge function are single—seal while the dual—seal means the additional safety pressure discharge to the body.

    For the seat ring of the single—seal structure, it depends on, after being inlaid into the support ring, the spring's pre—tightening force and the piston effect to have both seat ring and ball pressed tightly so as to form sealing. When an abnormal pressure rise occurs inside of the middle cavity of the body due to some reason, the seat ring will automatically discharge the pressure under the action of pressure differential to prevent any danger from happening, then after discharging the pressure it is reset automatically (Fig. 9).

    For the dual—seal structure formed with the supports of both dual—seal structured seat ring and O—ring, both seat ring and ball are made contacted under the spring's pre—tightening force and sealed under the pressure differential on the upstream(downstream) side of the pipeline and the middle cavity of the body. Regardless of on which side the medium's pressure is higher, both spring's pre—tightening force and piston effect make the seat rings on both upstream and downstream sides always tightly contacted with the ball to completely cutoff the fluid and prevent leak even if any one ofthem gets damaged. However there is no automatic pressure discharge function, so a pressure discharger has to be mounted in the middle cavity of the body to avoid abnormal pressure rise therein.
  8. Full or reduced diameter:
    The valve flow aperture is identical to the inner diameter of the pipeline (which can be reduced one if so required by users) for the sake of cleaning (Fig. 17).
  9. Locker:
    Use a locker to fix the valve so as to prevent maloperation of it and keep it in the correct opened or closed position.
  10. Extension of stem:
    Extension of stem is suitable for user under-ground and at low temperature, the extended size is depended on the necessity and the operation mode can be manual, pneumatic, electric, gas—hydraulic jointed or hydraulic actuation, also upon the necessity.
  11. Reliability of operation
    The relative sliding portion (seat ring and stem bearing) of a large aperture ball valve has a small operational torque due to its use of Teflon which has a small friction coefficient and can be flexibly operated for a long time even if there is no lubrication supplied for it.
  12. Different actuation modes
    The used, different and effective actuation modes include manual, pneumatic, electric, hydraulic and gas—hydraulic jointed ones.

 


Floating Ball Valve General

Main parameter of the products

 

Open the moment


Floating ball valve

Technical specification

Major parts material form


Forged steel floating ball valve

Technical specification

Major parts material form


Floating fully welded ball valve

Technical specification

Major parts material form

 


Fixed Ball Valve General

Main parameter of the products

Open the moment


Fixed cast steel ball valve

Technical specification

Major parts material form


Fixed forged steel ball valve

Technical specification

Major parts material form


Fixed fully welded structure ball valve

Technical specification

Major parts material form


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