Double Expanding
The main feature of a double expanding gate valve is the 2 pieces obturator that guarantees a simultaneous mechanical seal both in the upstream and in the downstream direction, from low to high pressure.

This is the reason why it is recommended when the contribution of the line pressure to obtain the seal is not required. This type of valve is normally used when a high reliability in critical conditions is required: in process lines applications, refineries (execution for high temperature is also available) and pipeline.

In open position, the double expanding gate valve allows running of pigs, scraper wipers or hot tap cutters through the pipeline with no danger or damage to the internal mechanic components of the valve. Viar Valvole double expanding valves are manufactured from high quality selected materials. CNC machinery ensure high quality dimensional accuracy. Before shipment, each valve is tested to ensure that all quality requirements specified by the applicable specifications are met.

Viar Valvole slab gate valves can be manufactured according to API 6D or to API 6A Standard. Viar Valvole is licensed to apply the API monogram on all of its slab gate valves.

Slab
The slab gate valve design is engineered with a single piece disc and floating seats.

The floating seat uses the line pressure to obtain a downstream sealing in high-pressure differential applications. Low-pressure sealing is allowed by coil springs that energize the seat pushing it against the gate. Fluids flow freely with a minimum of turbulence. In open position, running of pigs, scraper wipers or hot tap cutters through the pipeline is allowed with no danger or damage to the internal mechanical components of the valve.

Viar Valvole slab gate valves are manufactured from high quality selected materials.

CNC machinery ensure high quality dimensional accuracy. Before shipment, each valve is tested to ensure that all quality requirements specified by the applicable specifications are met.

Viar Valvole slab gate valves can be manufactured according to API 6D or to API 6A Standard. Viar Valvole is licensed to apply the API monogram on all of its slab gate valves.