Ball Valves
Global Valve and Controls main objective is to provide the industrial market with valves of the highest quality, performance and reliability; while still being cost effective. Therefore, the GVC ball valve continues to be researched and developed, making Global Valve and Controls one of the leaders in cutting edge technology and R&D. The GVC ball valve incorporates high quality TFM seats, investment cast up to eight inch, solid balls and a live loaded stem design as standard features to our line. These features are included at no addition cost, bringing our customers the highest quality valve at the lowest total cost of ownership.
The GVC Media Containment Bonnet, used in addition to our ball valve, controls fugitive emissions from being released into the earth’s atmosphere and prevents costly downtime.
Global Valve and Controls offers a vast variety of precision machined, solid balls which include but are not limited to, Alloy-20, Monel, Hastelloy-C, Stainless Steel and Duplex Stainless. The ball also has a mirror finish to prevent leaks which provides a bubble tight shutoff, reducing the torque or the force needed to stroke or cycle the valve. To reduce seat wear and ensure GVC valve reliability for a high cycle life, the ball edge has blended curvatures. In order to stabilize pressure between the GVC ball body cavity and the pipeline’s media flow, a ¼ inch hole is drilled into the stem slot to relieve cavity pressure thus providing an additional safety feature.
Body
Global Valve and Controls valve bodies are available in forged steel (up to 48”) and investment cast up to eight inch. Each GVC body casting or forging has a heat code which is marked for full trace ability. Certified Material Test Reports are available upon request.
Global Valve and Controls manufactures its valves in accordance to API 608, API 607, API 598, API 6D, B16.34, B16.5, B16.10, B16.25, NACE MR01-75 and our clients special requirements.
Global Valve and Controls offers the following: top entry design, end entry design, fully welded design in trunnion mounted and floating design.
Global Valve and Controls offers various types of end connections such as raised face(RF), ring type joint(RTJ), threaded ends, socket weld ends, and butt weld ends.
Please contact the factory for more details.
Stem Assembly
To ensure a positive contact, Global Valve and Controls manufacture its ball valve’s stem to be match mated with the ball and body. All GVC stems are design blow-out proof bottom entry for maximum safety.
The Global Valve and Controls live loaded stem design is a standard feature on the following valves; Series FS150/300, Series E1-150/300, Series FSD61, Series FS525, Series FSD525 and Series GVD20.
This design utilizes a stem seal arrangement where the seals are retained by a stem or packing nut, also include live loading of the stem seals. This live loading is accomplished by the addition of Bellville springs below the packing nut. The purpose of live loading the stem seals is to maintain the initial sealing load on the seals as they wear, or as they compress further, reducing or eliminating the need for packing nut adjustments. The Bellville springs perform this function by storing compressive force or potential energy as the packing nut is tightened, and releasing this force as the packing wear or compression occurs.
Live Loaded Stem Packing
Valve sizes 1/4" through 4' Models 525, E1, and FS feature strong large diameter stems with live-loaded, self adjusting sealing utilizing Belleville washers which automatically adjust to compensate for changes in temperature and wear patterns. Manual adjustments, which can cause damage to the seal and seat, are not required. The assembly is secured by a saddle-type lock and washer which prevents stem nuts from unthreading in high-cycle automation applications.
Stem Packing
An adjustable V-ring design creates a multiple seal between the stem and body. Each stem assembly is composed of three or four (dependant on valve size) TFM or graphite rings providing a very high cycle life by resisting creep and cold flow. The Peek Thrust Bearing and the Peek Thrust Washer combine to provide a secondary seal, reduce torque, and prevent galling.
Global Valve 525, E1, 2T/3T Series and FS Series valve stems feature anti-static grounding devices as standard. The devices ensure electrical continuity between valve ball, stem, and body, thus eliminating the possibility of static electric charges creating sparks within the valve.
Stem Design: Valve Size 6" through 12"
The stem is guided by the valve body and the gland, ensuring smooth operation even in high torque service. The independent packing gland can be easily adjusted without removing the mounting hardware or operator. The user friendly packing gland and gland sleeve are V-slotted to more equally distribute the load in the event one side is over tightened. For severe applications, optional Belleville washers can be added for self-adjusting live load, providing a continuous compression seal and anti-vibration protection.
Seat Design
Global Valve and Controls' valves are offered as standard with resilient seats which ensure bi-directional, bubble tight sealing while providing the lowest possible torque. These specially designed resilient seats feature relief holes or slots to relieve pressure past the upstream seat. This design reduces friction, minimizes seat wear and lowers operating torque. Global Valve and Controls' seats feature optimally designed curvatures to minimize contact forces between the ball and seat when the valve is in the open position. This design prevents cold flow, lowers torque, and reduces wear.
Media Containment Bonnet
In the event of a stem leak that cannot be corrected, Global Valve offers a Media Containment bonnet which easily mounts to standard valves. These units prevent costly downtime and allow maintenance to be scheduled when convenient. The Media Containment bonnet can be provided with a button-head check valve for injection of sealing agent. Also, this unit is an excellent, cost effective way to provide double stem sealing to address emission control requirements.