V-Type Spring Energized Seal

Taifno is a Chinese manufacturer of V-type spring energized seals. These seals are precision-engineered and customizable, designed for static sealing applications such as flanges, cover plates, and end faces. They deliver reliable sealing performance across a wide range of operating conditions, including pressures from zero to high levels, extreme temperatures, and exposure to the vast majority of chemical media.

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Product Description

The internal spring of the V-type spring-energized seal provides initial sealing force under zero-pressure conditions; system pressure further enhances the sealing effect—the higher the pressure, the tighter the seal.

Operating temperature range: -180°C to +200°C; pressure up to 45 MPa (dynamic) / 60 MPa (static); reciprocating speed up to 15 m/s.

V-Type Spring Energized Seal

What Is a V-Type Spring-Energized Seal?

V-type spring-energized seal consists of a PTFE U-shaped jacket with a V-shaped stainless steel spring inside. The V-spring features a "cantilever" design that concentrates its load at the leading edge of the sealing lip, providing a reliable wiping action.

How it works:

Zero pressure: V-spring provides initial sealing force — seals even when system is not pressurized

Under pressure: System pressure enters U-cavity and pushes sealing lips harder against mating surface — pressure = tighter seal

Self-energizing: No external force needed to maintain seal integrity

V-Type vs. U-Type: Which One Do You Need?

Feature	V-Type	U-Type
Sealing Direction	Axial — flanges, covers, end faces	Radial — piston rods, valve stems
Spring Type	V-shaped cantilever spring	Helical or cantilever spring
Best For	Static sealing	Dynamic sealing (reciprocating/rotary)
Wiping Action	Yes — reliable wiping of debris	Moderate

Why Choose V-Type?

Problem	How V-Type Solves It
O-rings fail under pressure cycling	Spring provides constant sealing force — unaffected by pressure fluctuations
Rubber seals degrade in chemicals	PTFE jacket is chemically inert — pH 0-14, universal resistance
Seals leak at zero pressure	Spring provides sealing force at zero pressure
High friction — stick-slip	PTFE has lowest friction — smooth motion, no stick-slip
Temperature extremes degrade elastomers	-180°C to +200°C — cryogenic to sterilization

Selection Guide

V-Type vs O-Ring vs U-Type

Feature	V-Type	O-Ring	U-Type
Zero Pressure Sealing	✅ Yes — spring provides force	❌ No	✅ Yes
Pressure	Up to 60MPa (static)	Moderate	Up to 60MPa
Temperature	-180°C to +200°C	-180°C to +150°C	-180°C to +200°C
Chemical Resistance	★★★★★	★★☆☆☆	★★★★★
Friction	★★★★★ lowest	★★★★☆	★★★★★
Sealing Direction	Axial	Radial	Radial
Best For	Flanges, covers, end faces	General static sealing	Piston rods, valve stems

Quick Selection Guide

If Your Service Is...	Choose...
Flanges, covers, end faces — static sealing	V-Type
Piston rods, valve stems — reciprocating motion	U-Type
General purpose, low cost, clean media	O-Ring

Primary Applications

Industry	Application
Chemical Processing	Reactor covers, flanges, pump housings — acids, solvents, aggressive chemicals
Pharmaceutical	Sterile processing equipment, bioreactors, filling machines — FDA/USP compliance
Semiconductor	High-purity gas and chemical seals, vacuum systems — ultra-purity
Aerospace	Fuel systems, hydraulic systems — extreme temperature, high reliability
Oil & Gas	Valve seals, wellhead equipment — high pressure, H₂S, corrosive media
Food & Beverage	Sanitary connections, filling equipment — FDA compliance

Real-World Applications

Case Study 1: Chemical Reactor — 3 Years Zero Leakage

Challenge: A chemical plant was experiencing leakage from a reactor manway seal handling aggressive acids at 150°C. Standard PTFE gaskets were cold-flowing and leaking every 6-8 months. Maintenance required full shutdown and cleaning.

Solution: Installed V-type spring-energized seal with glass-filled PTFE jacket for improved wear resistance. V-spring provided constant sealing force compensating for thermal cycling and pressure fluctuations.

Result: Zero leakage for over 3 years. No maintenance required. Eliminated annual shutdown costs.

Case Study 2: Pharmaceutical Filler — FDA Compliance Achieved

Challenge: A pharmaceutical filling machine required a seal for a rotary valve handling sterile product. Standard O-rings could not pass FDA extractables testing and required frequent replacement due to chemical attack from CIP/SIP cycles.

Solution: Supplied V-type spring-energized seal with virgin PTFE jacket and 316 stainless steel V-spring. FDA-compliant material. Full documentation provided.

Result: Passed FDA extractables testing. Seal survived repeated CIP/SIP sterilization cycles without degradation. No replacements needed in 18 months.

Note: Actual case results vary by application conditions. Contact us for application-specific recommendations.

Factory Factory Factory Factory

Technical Specifications

Product Properties

Parameter	Value
Temperature Range	-180°C to +200°C
Pressure — Dynamic	Up to 45MPa
Pressure — Static	Up to 60MPa
Speed — Reciprocating	Up to 15m/s
Speed — Rotary	Up to 1m/s
Material	PTFE jacket + Stainless Steel V-spring (304/316/301)
Chemical Resistance	pH 0-14 — virtually universal
Sealing Type	Axial sealing — static or low-speed rotary

Material Grade Options

Grade	Best For	Key Benefit	Chemical Limit
Virgin PTFE	Clean chemicals, FDA applications, general service	Universal chemical resistance, lowest friction, FDA compliant	Soft — lower wear resistance
Glass-Filled PTFE	Abrasive media, high wear, slurries	Increased mechanical strength, wear resistance	Not for HF or strong alkali
Carbon-Filled PTFE	Heat dissipation, anti-static, low friction	Thermal conductivity, improved creep resistance	Not for strong oxidizers
MoS₂-Filled PTFE充	Sticky media, low torque, enhanced lubricity	Reduced friction, improved wear resistance	Not for oxidizing acids

Spring Material Options

Spring Material	Best For
304 SS / 316 SS	General chemical service, moderate temperatures
316L SS	Improved corrosion resistance — aggressive chemicals, salt water
Elgiloy	Excellent corrosion resistance — aerospace, chemical, critical services
Hastelloy	Extreme corrosion resistance — highly aggressive chemicals, acids
Inconel	High-temperature strength — extreme heat (+260°C+)

Quality Assurance

100% Virgin PTFE Resin — no regrind, no recycled material. Consistent quality, batch after batch.

Precision Spring Manufacturing — Springs manufactured to exact specifications with CNC equipment.

Full Traceability — Every batch traceable from raw material to finished seal. Material certificates on request.

ISO 9001 Certified — Manufacturing processes certified under ISO quality management systems.

FDA-Compliant Grades Available — Virgin PTFE meets FDA 21 CFR 177.1550 and BfR requirements.

Custom Spring Alloys Available — 301/304/316 SS standard; Elgiloy, Hastelloy, Inconel for extreme conditions.

Test Test Test Test

FAQ

Q: What is a V-type spring-energized seal and when should I use it?

A: A PTFE U-jacket seal with a V-shaped stainless steel spring inside. Seals from zero pressure (spring provides initial force) to high pressure (system pressure energizes the lips).

Use it when O-rings or rubber seals fail, in aggressive chemicals, extreme temperatures (-180°C to +200°C), high pressure (up to 60MPa), or critical applications where leakage is not acceptable.

V-type vs U-type: V-type for flanges, covers, end faces (axial sealing). U-type for piston rods, valve stems (radial sealing).

If you are sealing a flange or cover, choose V-type.

If sealing a moving rod, choose U-type.

Q: How much does a V-type spring seal cost and what is the lead time?

A: Cost depends on diameter, material grade, spring alloy, and quantity. Standard sizes start at approximately X−X−Y. Custom sizes quoted per drawing.

Spring alloy impacts cost: 304 SS (standard, lowest cost) → 316 SS (improved corrosion) → Elgiloy/Hastelloy/Inconel (extreme corrosion/high temperature, higher cost).

Lead time:

Standard sizes: 5-7 days.

Custom sizes: 10-15 days.

Shipping: air 5-10 days, sea 15-30 days.