Metal Seated Ball Valve

Metal Seated Ball Valve is manufactured for high temperature up to 540℃ (may be higher based on the material of body and trim) or abrasion resistance. Relia Metal Seated Ball Valves are Zero leakage (bubble tight seal). Metal Seated Ball Valve is also called metal to metal ball valve, as the seat and ball are made from metal.

For metal seated ball valve, the seat ring and ball are precisely machined, coated by high velocity oxygen fuel(HVOF) coating process and lapped to match ball, creating a positive seal for bubble-tight performance. Relia Metal seated trunnion ball valves have many advantages such as excellent corrosion & wear resistance, tight shut-off, smooth control, low torque, wide temperature & pressure range, as well as stability under pressure. Metal seated ball valve provide long service life with outstanding fugitive emissions performance and low operating torques in even the toughest applications.

Metal seated ball valve for high temperature

The split seat design (Part No. 5) for high temperature metal seated ball valve provides freedom for thermal expansion of the ball without jamming, even at extremely high temperatures.

Zero leak metal seated ball valve

The sealing between the seat and body is O-ring. It is designed for temperature below 150˚C and zero leakage warrenty. This design is for gas comprssion project ect.

Leakage Rate

Zero leakage available (MUCH higher level than ANSI/FCI 70-2 Class V shut-off, Class VI).

Types:

Metal seated trunnion ball valves and metal seated floating ball valves.

Metal Seated Trunnion Mounted Ball Valves are split-body,  trunnion-mounted ball valve with spring-loaded seats with cavity relief,  they are double block-and-bleed capability.

Metal seated floating ball valve is with Zero leakage for high­temperature operating conditions. Furthermore, seats with hard surface materials in Chromium Carbide, Tungsten Carbide or Stellite are also available. All Relia floating ball valve are Antistatic Design and Automatic Body Cavity Relief.

Metal seated floating ball valve series includes a specific model for highly abrasive catalyst services or with the presence of solids, called SAT3.

Top Entry metal seated ball valves are available upon request.

Applications:

•  Oil & Gas
•  Refining / Petrochemical
•  Chemical Process
•  Power Generation
•  Pulp & Paper
•  Mining

Features & Benefits

a) Unique, the metal seated ball valve with patented single-seat ball valve design. It has a flat spring set acting through a hard-faced bearing against the bottom ball shaft which provides sufficient initial ball-seat load for valve tightness, even at low delta P.

b) Metal seated ball valve proven in qualification tests and field operation to be solids–proof, even for the toughest applications on slurry service with solids particles.

c) Tightness rates: Allowable leakage rate at full Delta P: ASME/ FCI 70-2 Class VI/V. Tighter shutoff available upon request.
The leakage rate also can be customization from end-user request

d) The metal seated ball valve  with standard extension bonnet/stem, whose design base on the different temperature range.

e) Uni-directional or bi-directional sealing

Product Range

Explosive Drawings for Metal Seated Floating Ball Valve

Materil List

Remarks:

TCC-Tungsten Carbide Coating

Cr3C2-Chromium Carbide

Metal to Metal Seat Ball Valve

Surface Coatings for Metal Seated Ball Valve

Unlike surface treatment methods whereby the existing surface is changed by diffusion, in surface coating an outer layer of new material is generated on the surface. The following types of surface coating methods are available in the Habonim metal seated range; chromium carbide with nickel chrome binder (Cr3C2), tungsten carbide with cobalt binder (WC-Co), and stellite welding.

Valve Ball Hard Coating done by HVOF                       Valve Ball Hardness is Over 600 HRC

Stellite

Applications:

- Liquid + Gaseous media with partially entrained particles / solids (moderate operating cycle)
- Excellent wear resistance / good corrosion resistance
- Wide temperature range

A cobalt-based stellite coating on valve ball and seat provides excellent mechanical wear resistance, with good corrosion resistance at temperatures up to 538˚C (1000˚F). The Stellite is applied by a Plasma Thermal Arc (PTA) method. Most stellite alloys are cobalt based with elements of Chromium (Cr), Carbon(C), Tungsten (W) and Nickel (Ni). Stellite is broadly used in the pulp and paper industry, as well as in refining applications, such as catalyst handling and hydrocracker processes.

WC-Co (Tungsten Carbide)

Applications:

- Liquid + Gaseous media with partially entrained particles / solids (high operating cycles)
- Excellent abrasion resistance / good corrosion resistance

Tungsten Carbide with a cobalt binder coating applied by HVOF techniques similar to Cr3C2.WC-Co coating applied mainly to 400 series martensitic stainless steel results with micro-hardness as high as 72HRC. This coating resists cryogenic temperature down to -196˚C (-320˚F) and high temperatures up to 538˚C (1000˚F). WC-Co is a wear resistance anddense coating with chemical resistance to sulphur environment on Nickel based alloy.

Cr3C2 (Chromium Carbide)

Chromium Carbide with nickel chrome binder applied by a High Velocity Oxygen Fuel (HVOF) gun creates a 0.3mm hard outer layer. Cr3C2 coating applied to high strength steels, results in a micro-hardness of up to 68HRC. This coating resists cryogenic temperatures down to -196˚C (-320˚F) and high temperatures up to 815˚C The valve maximum temperature is 650°C. All the temperatures above 650°C refer to the coating or bolts performance only (1500˚F). This multipurpose wear resistance coating is used extensively in the power generation, refining and hot catalyst handling services. Its limitations are in wet sulphur or chloride environments where sulphuric acid can form and attack the coating.

Coating Testing

•  Bond Strength Tensile Test
•  Shear Strength Tensile Test
•  Macro Hardness Rockwell Test
•  Porosity Determination
•  Bond Line Contamination
•  Abrasion Wear Testing

Selecting of Ball and Seat Coating

For metal seated ball valves, ball and seat coatings are selected with careful consideration of the service conditions. Relia uses modern technologies such as high velocity oxygen fuel (HVOF), plasma or super D-GUN (SDG) to apply the coatings to the ball and seats. To correctly select a coating, the following parameters need to be considered:

• Is the medium abrasive?
• Are there thermal shocks?
• Is the medium corrosive?
• What is the cycling frequency?
• What is the temperature?

Metal Seated Ball Valve VS Soft Seated

Metal seated ball valves are introduced when soft seated ball valves are not suitable with the fluid.

Applications:

Soft seated ball valves are suitable for the working temperature lower than 260℃(when PEEK seat is introduced), while metal seated ball valves are suitable for temperature up to 540℃ (may be higher based on the material of body and trim).

Another reason to choose metal seated ball valves are due to its feature of  abrasion resistant, while soft seated is not.

Seat Material Options and applications:

Soft Seat:

PTFE-Made from Virgin Teflon, this is the most common sealing material; its chemical compatibility is excellent for almost all media. Temperature -50°F to 400°F.

PTFE-15% glass reinforced PTFE, suitable for temperature -50°F to 450°F, chemical resistance is compatible to virgin PTFE with better wear factor. The standard in most all of our ball valves.

Carbon Filled PTFE-25% Carbon Graphite with 75% PTFE, this material offers a wide temperature range with better wear resistance than standard RPTFE. Good for steam service -50°F to 450°F.

Delrin-This material is very rigid, suitable for high pressure up to 5000psi dependant on valve size and temperature range of -50°F to 180°F.

PEEK-Best suited for high temperature and pressure service, suitable for tobacco and nuclear service. Temperature -70°F to 550°F.

Nylon-Special Nylon seats are offered for higher pressure and lower temperature service. They can be used in high-pressure air, oil and other gas media but are not suited for strong oxidizing agents. Temperature rating -30°F to 200°F

Metal Seat:

Stellite Seat Surface-Recommended for service with severe flashing or hydraulic shock, abrasive media or where possible trapped metal may exist. Relia valve metal seats are hand lapped to the ball as individually matched sets, assuring line contact between valve ball and seats, resulting in smooth operation and tight shut off class. Relia valve offers metal seat ball valve in different classes of Shut Off including Class IV, V and VI.

Cr3C2, suitable up to 815°C, Good corrosion resistance.

WC-Co, Tungsten, Carbon Cobalt, Excellent corrosion resistance.

Cost & Price:

The cost of metal seat ball valve is much higher than softed seat ball valves.