Product Details
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WB2 Chemical Seal

When handling highly oxidizing or corrosive chemical fluids—such as sulfuric acid, hydrochloric acid, strong alkalis, and various oxidizing agents—standard stainless steel mechanical seals often suffer from rapid corrosion failure. The WB2 Series addresses this challenge through a unique outside-mounted (externally mounted) configuration and a PTFE (Teflon) bellows design.

The core advantage of this "Media Isolation" architecture is that all metallic components, including the multiple springs and fasteners, are positioned outside the seal chamber. By ensuring zero contact between metal parts and the corrosive media, the WB2 fundamentally eliminates spring failure caused by chemical attack, crystallization, or debris accumulation. It is the premier choice for chemical centrifugal pumps, reactors, and agitation equipment handling extreme chemicals.

Technical Specifications

Parameter	Range / Specifications	Industrial Application Insights
Shaft Range	25mm - 80mm / 1.0" - 3.15"	Compatible with standard chemical pump & agitator shafts
Max Pressure	≤ 0.5 MPa (5 bar)	Specifically optimized for atmospheric or low-pressure media
Temperature	-20°C to +120°C	Based on the thermodynamic stability of high-grade PTFE
Max Velocity	≤ 10 m/s	Ideal for low-to-medium speed rotating equipment
Rotary Face	PTFE / SiC	Pure PTFE or Glass/Carbon-filled PTFE for enhanced hardness
Stationary Seat	Ceramic / SiC	High-purity Alumina Ceramic or Reaction Bonded SiC
Secondary Seals	PTFE (V-Ring / Square Ring)	All-PTFE construction for ultimate chemical inertness

Key Product Advantages

Extreme Chemical Inertness: The primary seal body (bellows) is fabricated from high-grade PTFE. It resists virtually all known strong acids, bases, and solvents, except for molten alkali metals and elemental fluorine.
External Spring Protection: By exposing the springs to the atmosphere rather than the process fluid, the seal prevents corrosion-related spring "hang-up." This also allows technicians to perform visual inspections of the spring compression and seal status without dismantling the pump.
Uniform Load Distribution (Multi-Spring): The multi-spring design provides more precise and uniform axial pressure compared to single-spring variants. This ensures the seal faces maintain a stable micron-level liquid film, even under conditions of minor equipment vibration.
Modular Component Design: The rotary seal head and PTFE bellows feature a detachable assembly. This modularity allows for the independent replacement of worn seal faces, significantly reducing long-term MRO (Maintenance, Repair, and Operations) costs.

Expert FAQ & Installation Guidelines

Why is the WB2 Series restricted to operating pressures below 0.5 MPa?

Due to the outside-mounted PTFE bellows structure, internal fluid pressure exerts an outward force that attempts to "blow out" or deform the bellows. For high-pressure, highly corrosive applications, we recommend chemical seals with metallic reinforcement rings or balanced-face geometries.

What are the critical industry-specific details to observe during installation?

Stationary seat perpendicularity is vital. Since PTFE exhibits "cold flow" (creep) characteristics, any misalignment in the face perpendicularity will lead to uneven loading and premature failure. Furthermore, never strike or tap the PTFE surfaces; even a microscopic scratch can become a high-risk leak path.

Can the WB2 seal be operated in a dry-run condition?

No. Although PTFE has inherent self-lubricating properties, the seal faces still require a liquid film (from the media or a flush) to dissipate frictional heat. Dry running will cause a rapid temperature spike, leading to thermal deformation or total destruction of the PTFE components.

Operating Limits

Pressure in the sealed chamber	≤0.5MPa
Temperature in the sealed chamber	-10℃~100℃
Linear velocity	≤15m/sec

Additional Advantages

Spring unit averted from the product so no sticking and clogging of the springs
Safe operation (no fractures) because of seal face locking by square pin
Suitable for pressure reversals
Operation in vacuum without additional seat locking possible
No damage of the shaft by a dynamically loaded O-Ring
Small installation sizes
Best suitable for conversions, no adaptations of the pump
Insensitive to solid containing and abrasive media
Advantages of a balanced seal even with plain shafts
Insensitive to shaft movements because of the stationary design

Product Features

The seal is replaceable for BT AR type
We have all the mould from 8mm to 70mm, all the rubber mould have LM (our trade mark) printed
From shaft size 30mm, we will use metal cup to hold the rubber to avoid its disassembling after long time
The color of ceramic could be yellow and white for clients choice

Operating Limits

Shaft diameter	Pressure	Temperature	Sliding velocity
20~100mm	up to 0.5Mpa	-10~100°C	15m/s

Material Specifications

Component	Materials
Rotary Ring	Car / SIC/TC/Cer
O-Ring	EPDM, NBR, AFLAS, Kalrez, PTFE
Spring and Metal Parts	SUS304, SUS316
Stationary Ring	Car / SIC /TC/Cer

Applications

Water and waste water technology
Chemical industry
Refining technology
Dirty, abrasive and solid containing media
Fugitive hydrocarbons (no API seal!)
Sticky and stringy media
Chemical standard pumps
Sewage pumps

Shipping & Payment Terms

Port of Loading: Shanghai
Shipping Method: DHL, UPS, FEDEX, TNT, etc
Payment Terms: T/T, Western Union, money gram

Our Services

OEM/ODM orders are available for our factory
Accept customized mechanical seals according to your drawing or requirements
Small quantity is accepted
Provides excellent quality with competitive price

WB2 Chemical Seal product image showing mechanical seal components and construction

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Categories	Chemical Seal
Brand Name:	JG
Model Number:	301
Certification:	FDA certificate
Place of Origin:	Zhejiang, China
MOQ:	1pcs
Price:	USD
Payment Terms:	T/T,Western Union,MoneyGram
Supply Ability:	1000PCS
Delivery Time:	3~10DAYS
Packaging Details:	white box
product name:	WB2 Chemical Seal
Size:	20~100mm
Application:	Chemical pump
Pressure:	up to 0.5Mpa
Temperature:	-10°C to +100°C
Speeds:	15m/s
Metal parts:	SS304,SS316
Type:	WB2