Through conduit gate valves are a core part of Valland’s production. In a through conduit design the gate has a full circular bore: in open position the valve offers an unobstructed, piggable passage with no pressure drop, which makes it the standard choice for pipeline service, launcher/receiver stations and metering systems.

The range covers three families, all fully engineered in-house: slab gate valves (model B11, including the parallel slab execution), single expanding gate valves (model B22) and the double/single expanding family (models B21, B41). Slab and single expanding designs offer a compact and cost-effective solution; the double expanding design provides mechanical wedging of both seats — sealing independently of line pressure — and can be engineered to achieve DIB-1, making it the preferred option for heavy duty and critical isolation.

Valves are designed to API 6D, API 6DSS or API 6A, with cast or forged body. The back seat configuration of stem and bonnet allows stem seal maintenance with the valve in line and under pressure. SIL certification for slab and expanding gate valves has been achieved (up to SIL 3).

A recent reference is the supply of 42 double expanding gate valves with electric actuators for the AkerBP PWP project (Aker Solutions, Norway).