Weir Delta is an industry-leading manufacturer of high-quality knife gate valves, specializing in Zero Leakage Severe Service Bi-Directional knife gate valves.
Weir Delta provides a wide range of valves in standard cast alloys such as Ni-Resist, Carbon and Stainless Steel, Super austenitic, Duplex, Hastelloy, and Titanium, as well as bodies manufactured from wrought plate or forgings. All of Delta Industrial™ high-performance knife gate valves are designed to survive in extreme abrasive, erosive, and corrosive environments. Thus, we can satisfy clients’ needs for dependability and maximum uninterrupted operation.
Weir Delta is recognized worldwide as a leader in the design and manufacturing of severe service knife gate valves. There are at least five distinct types of knife gate valves. Weir Delta produces only a genuine “knife” gate valve, capable of cutting, shearing, and closing against solids while still producing a tight shut-off. This unique knife gate valve design, referred to as a guided shear gate, can offer the highest performance in the most severe applications where solids are in a solution, suspension, or both. These zero-leakage valves can even operate in clear solutions – an area where traditional knife gates are not appropriate.
Delta Industrial™ valves are designed for isolation service duties that include:
Delta Industrial™ knife gate valves have a primary elastomer seal provided by an interference fit cord stock (ring seal) on the gate’s perimeter that, by design, is protected from the flow. The precision machined metal seat provides a secondary seal and over-closure protection. The angled leading edge on the blade is capable of shearing through objects in the flow media. The primary wear surface is metal instead of an elastomer sleeve; therefore, it can be repaired by replacing the wear rings or re-coating the overlay. The body and wear areas can be manufactured from various materials to ensure optimum wear and corrosion protection.
Delta Industrial™ knife gate valve utilizes an in-service, repackable, transverse (gate) seal to seal from external leakage. The transverse seal features an upper and lower scraper and an elastomer energized by a pliable compound that may be added on while the valve is in service. The gate is completely removed from the process flow in the fully open position.
The Delta Industrial™ Class 150 valve comprises three different series: 150, 15S, and 15L.
The 15S and 15L series are fully rated ASME Class 150# (PN20) guided shear gate valves and are available from 50 mm (2”) through 1524 mm (60”).
Their standard face-to-face dimensions conform to MSS SP-135, and they operate to a maximum pressure of 1965 kPa (285 psi) – dependent upon materials selected.
The Delta Industrial™ 150 series is also available from 50 mm (2”) through 1524 mm (60”) with a maximum pressure rating of 1035 kPa (150 psi).
Delta Industrial™ Class 300 valve comprises three different series: 300, 30S, and 30L.
The 30S or and 30L series are fully rated ASME Class 300# (PN50) guided shear gate valves and are available from 50 mm (2”) through 900mm (36”).
Their standard face-to-face dimensions conform to MSS SP-135, and they operate to a maximum pressure of 5100 kPa (740 psi) – dependent upon materials selected.
The Delta Industrial™ 300 series is also available from 50 mm (2”) through 900 mm (36”) with a maximum pressure rating of 2068 kPa (300 psi).
The Delta Industrial™ Class 600 is a fully rated ASME Class 600# (PN100) guided shear gate valve.
It is available from 50 mm (2”) through to 600 mm (24”) and operates to a maximum pressure of 10200 kPa (1480 psi).
The Delta Industrial™ Class 600 valve features carbon steel bodies and a hardened 17-4-PH stainless steel gate.
For severe conditions, additional options such as wear rings, Chromium Carbide (CCO), or Tungsten Carbide (TCO) body overlays are available.
The Delta Industrial™ series Centre, Block and Bleed (CBB) valve combines two separate gates in one body. Each is sealed with its gate seal and transverse seals and operated by a single actuation mechanism. The center section hosts the drain, purge, or bleed connections and can be customized for each specific application. Maximum operating pressures of 5100 kPa (1440 psi), dependent upon materials selected.