Blast Gates for Industrial Ductwork | Specifications & Selection

Product Specifications

Technical details and manufacturing context for Blast Gates

Definition

Blast gates are specialized valves or dampers used within industrial ductwork systems to control, redirect, or completely block the flow of air, dust, chips, or other materials. They function as critical isolation points, allowing operators to manage airflow to specific branches of a duct network, optimize system performance, and facilitate maintenance by sealing off sections. Typically constructed from galvanized steel, stainless steel, or aluminum, these components are available in nominal diameters from 50 to 600 mm, matching standard duct sizes per ISO 6708. Operating pressure ratings range from 1.0 to 1.6 MPa (PN10/PN16 per ISO 7005), with leakage rates between 0.1% and 0.5% (Class A). Temperature limits span -40°C to 85°C, constrained by seal material. Body materials include WCB, CF8, and CF8M (ASTM A216/A351), while seat materials are PTFE, RPTFE, or PPL, selected for chemical compatibility. Actuation torque requirements vary from 10 to 150 N·m, depending on size and actuator type. Face-to-face dimensions follow ISO 5752 short pattern, ranging from 40 to 300 mm. Weights range from 5 to 120 kg, depending on size and material. These gates operate by sliding, pivoting, or rotating a gate or blade across the duct cross-section, with manual, pneumatic, or electric actuators controlling position. They serve as essential components in dust collection, material handling, and ventilation systems. When selecting a blast gate, verify model-specific values for pressure, temperature, leakage, and materials with the manufacturer, as these parameters are reference ranges. Confirm compliance with applicable standards for your application. Regular inspection for seal wear, gate alignment, and actuator function is recommended to ensure reliable isolation and flow control.

Working Principle

A blast gate operates by sliding, pivoting, or rotating a gate or blade (often a flat plate or guillotine) across the duct's cross-section. When open, the gate retracts to allow unimpeded flow. When closed, it forms a seal against the duct walls, creating a barrier that stops flow. Manual, pneumatic, or electric actuators control the gate's position. The sealing effectiveness depends on the seat material and the force applied by the actuator. Proper installation and alignment are critical to achieve the rated leakage class. Over time, wear or debris accumulation can compromise the seal, leading to increased leakage. Regular maintenance includes cleaning the gate surfaces and checking actuator operation.

Common Materials

Galvanized Steel, Stainless Steel, Aluminum

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	50–600 mm	Matches duct sizeISO 6708
Leakage Rate	0.1–0.5 %	Class A per ISO 5208 Measured at the stated test pressure
Operating Temperature	-40–85 °C	Seal material limits
Body Material	WCB/CF8/CF8M	Carbon or stainless steelASTM A216/A351
Seat Material	PTFE/RPTFE/PPL	Chemical compatibility
Actuation Torque	10–150 N·m	For manual or actuator sizing
Face-to-Face Dimension	40–300 mm	Short patternISO 5752
Weight	5–120 kg	Depends on size and material
Flange Rating	PN10/PN16	Matches operating pressureISO 7005

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Gate Blade/Plate Part
The moving element that blocks or allows flow through the duct.

Material: steel
Frame/Housing Part
The structural body that mounts to the duct and provides sealing surfaces.

Material: steel
Seal/Gasket Part
Creates an airtight seal between the gate blade and frame when closed.

Material: rubber or neoprene
Actuator/Handle
Mechanism (manual lever, pneumatic cylinder, electric motor) to position the gate.

Material: varies

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Ductwork

View system integration details

Manufacturers of Blast Gates

Manufacturer profiles associated with Blast Gates.

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Frequently Asked Questions

What are the typical materials used for blast gates?

Blast gates are commonly made from galvanized steel, stainless steel, or aluminum. Body materials may include WCB, CF8, or CF8M, and seat materials are typically PTFE, RPTFE, or PPL. The choice depends on the application and chemical compatibility.

How do I select the correct blast gate size?

Select a blast gate with a nominal diameter that matches your duct size, typically ranging from 50 to 600 mm per ISO 6708. Also consider operating pressure, temperature, and leakage requirements. Always verify model-specific values with the manufacturer.

What is the leakage rate of a blast gate?

Blast gates typically have a leakage rate between 0.1% and 0.5%, classified as Class A. The actual leakage depends on the seal material, gate condition, and installation quality.

Can blast gates be automated?

Yes, blast gates can be equipped with pneumatic or electric actuators. The required actuation torque ranges from 10 to 150 N·m, depending on size and operating conditions. Manual operation is also possible.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 10 bar (150 psi)
flow rate:	0.5 to 50 m³/s (1,000 to 100,000 CFM)
temperature:	-20°C to 150°C
slurry concentration:	Up to 30% solids by weight

Blast Gates

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards