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Gate Valve

Through-Conduit Slab Gate Valve — Low Temperature Carbon Steel Flanged Pipeline Service

Specification

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Details

HD Flowtech through-conduit slab gate valves are engineered for full-bore isolation service in water supply, water transmission, and low-temperature pipeline systems requiring zero cavity entrapment and complete pigging compatibility. The WCW low-temperature carbon steel cast body provides reliable structural integrity and impact toughness at PN16 operating pressures for water and general service applications. The through-conduit design — where the gate plate contains a full-bore circular opening that aligns precisely with the pipeline bore in the open position — eliminates the valve cavity entirely from the flow path, preventing fluid entrapment, sediment accumulation, and pressure buildup in the valve body that occur with conventional slab gate designs. The precision-machined stainless steel gate bore with elastomeric sealing ring provides bubble-tight shut-off in both open and closed positions — the full-bore opening visible in the front view images confirms complete unobstructed flow passage and pigging tool compatibility. Spring-loaded floating seats maintain constant sealing contact against the gate under all pressure conditions, providing reliable bidirectional shut-off and self-relieving cavity protection. A bottom drain flange allows controlled cavity drainage during maintenance. The gear operator provides low-effort actuation for large-bore PN16 service. Flanged end connections to EN 1092-1 and ASME B16.5 ensure direct integration into standard water and industrial pipeline flange systems.

Gate Valve Technical Overview

How to Choose the Right Gate Valve for Industrial Applications

Through-conduit slab gate valves are selected for full-bore isolation service in water transmission, municipal pipeline, and industrial systems where zero cavity entrapment, complete pigging compatibility, and bidirectional sealing are required. The through-conduit gate design eliminates the valve body cavity from the flow path in the open position — preventing sediment accumulation, biological growth, and pressure entrapment that occur with conventional gate and ball valve body cavities in water supply and transmission pipeline service.

Full-bore through-conduit design is mandatory for pipeline systems requiring inline inspection tools (pigs) to pass through the valve without obstruction — water transmission mains, industrial cooling water pipelines, and process systems where regular inline cleaning and inspection are required without valve removal. The bidirectional sealing capability with spring-loaded floating seats provides positive shut-off against flow from either direction, making through-conduit slab gate valves suitable for pipeline sectioning, pump station isolation, and reservoir inlet/outlet control where flow direction may reverse under system conditions.

Body material selection — WCW and LCB for low-temperature and cold climate water service, WCB for standard process and water service, and stainless steel (CF8M) or duplex grades for corrosive applications — is determined by fluid type, operating temperature, and pipeline environment. Gear operators are standard for large-bore service, with electric, pneumatic, and hydraulic actuators selected for automated remote operation and SCADA integration in water treatment plants and transmission pipeline systems. Design standard API 6D governs through-conduit slab gate valves for pipeline service, covering full-bore design, bidirectional sealing, and pigging passage requirements