General-Purpose Full Lift Safety Valve

General-Purpose Full Lift Safety Valve (Closed Bonnet, Flanged)

A full lift safety valve is a critical protective device for pressure equipment. When system pressure approaches the set pressure, the valve’s full-lift mechanism enables a fast, near-instant opening to maximum lift. This rapid full opening creates a high-capacity discharge path, allowing excess pressure to be released quickly to reduce the risk of equipment damage, leakage incidents, and unplanned shutdowns.

Why full-lift matters in real operation

In many industrial systems, pressure can rise faster than operators can respond—especially during upset conditions such as blocked outlets, control valve failures, thermal expansion, or rapid phase changes. A full-lift design is preferred when the process requires:

Fast response to overpressure
High relieving capacity to stabilise system pressure quickly
Predictable opening behaviour with repeatable performance

This model uses a closed bonnet design, which helps isolate the spring chamber from environmental influences and the process medium. In practical terms, closed bonnet construction supports more stable performance where external contamination, moisture, or corrosive atmospheres could otherwise affect internals. It also reduces the likelihood of media-related issues around the bonnet area, improving operational safety and site cleanliness.

Compliance and certification (procurement-ready)

This valve is designed and certified to meet commonly specified European requirements:

VdTÜV
AD2000-A2
EN ISO 4126-1

For many EPC, plant owners, and auditors, these references are not “nice to have”—they are often mandatory for acceptance, documentation packages, and commissioning.

Typical applications and suitable media

This general-purpose full lift safety valve is suitable for a wide range of services, including:

Steam systems and boilers (where rapid relieving is essential)
Aggressive gases and vapours
Liquids requiring dependable overpressure protection

Common industries and use cases include utilities, chemical processing, general manufacturing, and thermal systems where operating conditions vary and reliability is a priority.

Key Features

Full-Lift High-Capacity Discharge
The full-lift design enables the valve to open rapidly to its maximum lift height, ensuring high relieving capacity and fast elimination of excess system pressure.

Certified to European Standards
Designed and manufactured in compliance with VdTÜV, AD2000-A2, and EN ISO 4126-1 standards, ensuring reliable performance and regulatory conformity.

Closed Bonnet Construction
Prevents external environmental influence and minimizes media leakage, enhancing operational safety and long-term stability.

Reliable Overpressure Protection
Provides dependable pressure relief for steam, gas, vapors, and liquid systems across a wide range of industrial applications.

Multiple Material Options
Available in cast iron (EN-JL1040), ductile iron (EN-JS1049), and carbon steel (1.0619+N) to match different pressure and temperature requirements.

Wide Pressure Range
Suitable for PN 16 / Class 150 and PN 40 / Class 300 systems, covering most general industrial process needs.

Broad Size Availability
Offered in sizes from 1/2″ to 14″ (DN 15–250), allowing flexible integration into various piping systems.

Stable Reseating Performance
Engineered for consistent opening and reseating characteristics to maintain system pressure stability.

Low Maintenance Design
Robust spring-loaded mechanism ensures long service life and reduced maintenance frequency.

Versatile Application Scope
Ideal for pressure vessels, steam boilers, chemical processing, and general industrial equipment manufacturing.

Material	EN-JL1040 (Cast Iron) EN-JS1049 (Ductile Iron) 1.0619+N (Carbon Steel)
Temperature	-10°C to 300°C (-14°F to 572°F) for EN-JL1040 Cast Iron models -10°C to 350°C (-14°F to 662°F) for EN-JS1049 Ductile Iron models -60°C to 450°C (-76°F to 842°F) for 1.0619+N Carbon Steel models
Pressure	PN 16 / Class 150 (16 bar / 150 PSI) PN 40 / Class 300 (40 bar / 300 PSI)
Connection	Flange
NPS	1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″, 2-1/2″, 3″, 4″, 5″, 6″, 8″, 10″, 12″, 14″
DN	15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250
Medium	Steam, aggressive gases, vapours and liquids

CSV-510