• darkblurbg
  • darkblurbg
  • darkblurbg

Gate Valves


Slab

Gate Valves




Seat and Disc
The Solid flat disc and the seats are made from forged steel. Both can be ENP coated to prevent corrosion or galling. Seats can be provided with a thermoplastic insert in the face in contact with the disc. This soft seat insert guarantees the primary sealing while the metal contact between disc and seats guarantees the secondary sealing. Metal to metal seating design is available upon request for abrasive service and for high temperature design. In this second case, the seats and the disc are coated with HVOF Tungsten or Chrome carbide. In normal operating condition, the slab gate does not need to be lubricated to maintain a seal. Sealant can be injected, as a temporary solution when damage occurs in the sealing members.

Stem Design and Seal System
The valve is engineered with rising stem. The standard stem seal is with braided graphite and can be fitted with an emergency grease injection device or/and with a backseat between stem and bonnet. In the event of a gasket failure, this feature allows restoring of the sealing.

Double Block and Bleed
The DBB design is a standard feature of the Viar Valvole slab gate valves. When the valve is in fully closed position, pressure and/or fluid in body-bonnet cavity can be released through the body drain system. In the same position, a double isolation between the two sides of the valve is achived.

Self Relieving Seats
 The single piston effect design of the seats automatically relieves the body pressure in excess. In case of fluid thermal expansion and, generally, when the pressure in the body cavity exceeds the pressure in the pipeline, the seat is forced back into its housing and the pressure in excess is released between the seat and the gate into the line.

Full Bore Through Conduit
The pressure drop is minimized without any turbulence. The valve is Piggable: Pigs and scrapers can be run through the valve without damages to the valve.

Optional Features
• Material Options (CRA Alloys for Very Corrosive Service Media)
• Seat and Stem Sealant Injection System
• Actuation
• Tungsten Carbide Coated, Metal to Metal Sealing.

Benefits
• Compact Design
• Gas Tight, Metal to Metal Sealing
• Corrosion Resistant
• Easy Maintenance
• High Pressure/High Temperature
• Bi-directional Sealing
• Fast Closing
• Fire Safe
• Protection against Over Pressure.


Company

COMPANY HISTORY

100% Italian Family Owned.

EQUIPMENTS

Grant flexibility and reliability.

ASSEMBLY & DELIVERY

Granting Fast Track deliveries

QUALITY

Control & Assurance.

DESIGN

Simulation of every structural aspect.

SPECIAL TEST

In addition to API6D standard tests.

Product selector


Related product

Double Expanding

Gate Valves

Slab

Gate Valves

Down load files

Brochure Gate
uni iso 9001 - 2008
TA-LUFT ORING GRAPHITE
TA-LUFT GRAPHITE
SIL 3 TRUNNION
SIL 3 FLOATING
RTN
Quality management certificate
PED Quality assurance certificate
ATEX
BP OHSAS 18001-2
BS OHSAS 18001
Certificate of API 6A monogram
Certificate of API 6D monogram
Certificate of API 6DSS monogram
GOST R-1
GOST R-2
GOST R-3