Electric Fully Welded Ball Valve Handwheel Operation

• Fully Welded Body Structure:The valve body is integrally welded from forged pipe sections and body forgings using fully automatic Submerged Arc Welding (SAW) or Gas Shielded Arc Welding (GTAW/GMAW). With no body mid-flange or bolted connections, it completely eliminates external leakage paths. The design service life is 30–50 years, matching that of the pipeline.

• On–Off Type:Performs open/close two-position control with adjustable stroke time of 15–120 seconds, supporting local/remote/stop three-state control.

• Modulating Type:Equipped with a 4–20mA positioner to achieve 0–100% continuous control with regulation accuracy of ±1%, supporting PID control loops.

• Intelligent Type:Integrates Profibus/Modbus/HART communication protocols, enabling remote diagnostics, fault pre-warning and predictive maintenance.

• Ingress Protection:IP68 waterproof and dustproof, suitable for buried, humid and harsh environments.

• Mechanical Override Clutch:The handwheel automatically disengages during electric operation and engages during manual operation, protecting the motor and transmission mechanism.

• Torque Limiter:Mechanical torque limitation is provided for handwheel operation to prevent over-torque damage to valve internals.

• Position Indication:The handwheel is fitted with a dial and pointer for intuitive display of valve opening, supporting precise adjustment.

• Locking Device:The handwheel can be locked in any position to prevent misoperation and unauthorized interference.

• Operating Force:Optimized gear ratio design ensures handwheel operating torque ≤ 360N, allowing single-person operation of large-bore valves.

• Trunnion-Mounted Ball:The ball is secured in body bearings by upper and lower trunnions, maintaining precise positioning under high pressure differential and fluctuating temperature conditions, avoiding eccentric wear of sealing surfaces and ensuring long-term reliable sealing.

• Full Bore / Reduced Bore Optional:Full bore design allows smooth passage of pigs and intelligent inspection devices, while reduced bore design optimizes cost efficiency for flexible selection according to service requirements.

Electric Fully Welded Ball Valve Handwheel Operation 3D Diagram

J-VALVESSPE can supply a range ofseat types and configurationsto meet specific process needs:

J-VALVES trunnion mounted ball valves standard seat ringsare soft-seated by the use of athermoplastic or elastomeric or Meta

Seats-Tungsten /Chrome carbide /ENP

Single Piston (SPE) , Double Piston effect (DPE) and Combination (SPE x DPE) seats are available.

Seat Princlple

Two independent seat rings grant the sealing, barrieragainst the line pressure actingon the upstream and downstreamsides of the valve which allows the valve tobe bidirectional.

A set ofcoil springs acting, between the upstream side ofeach seatring,andthe body,generate an uniform thrust on theseat which push the same against the ball and grant the sealingfeature with no orverylow pressureinthe line,when the line pressure increasethe thrust actingon theseat increases proportionally and the sealing leatureis granted throughout the fullpressure range.

The J-VALVES SPE trunnion mounted ball valves are available with Double

Block & Bleed in dependent oftheseat type.

Valve seating variations

Seat Design	Single piston effect (SPE)	Double piston effect(DPE)-DIB 1	Combined DIB 2
Bi-directional sealing	Yes	Yes	Yes
Body-Cavity Self relieving	Yes	No	Yes
Double Barrier	No	Yes	Yes (preferred direction only)

Single Piston Effect

Single piston effect (SPE) is the stand ard feature for theseat rings of the J-VALVES SPE trunnion mounted ball valves.

On a SPE seat ring:

The pressure ac tingon the upstream side ofthe seat ringgenerates aforce which push theseattowards the ball.The pressure actingon the downstream side ofthe seatring generates a force which pull theseatring away fromthe ball.

Anyoverpressure which may be generated by the thermal expansion of the fluid trapped in thebodycavity with the ballin fully closed position, will beautomatically dischargedinthe line on the lower pressure side.

Double Piston Effect

Double piston effect(DPE) is a stand ard feature fortheseat rings ofthe J-VALVES trunnion mounted ball valves & recommended forwelded body valves. Ona DPE seat ring, both the pressure acting on the upstream sideof theseatring andthe pressure acting on thedownstreamside of the  seatring, generatea forcewhich push the seattowards the ball.

With th is type ofseat ring,the eventual over press ure whichmay be generated by the thermal expansion ofthe fluidtrappedinthebodyeavitywith theball in fullyclosed position,can be discharged by the use of:

An external safetyrelief device.

The Double Piston Effect grants a double sealingfeature,iftheupstreamseat ringisdamaged, thedown stream seatgrant the sealingfeature of the valve.