SBV Type 11/Type 12 safety relief valve
Opens automatically at the set response pressure and closes again as soon as the system pressure falls below the closing pressure.
Direct-acting, without auxiliary power
The system pressure acts directly on the spring-loaded diaphragm and operates the valve automatically.
Type 11/Type 12 Safety Relief Valve: automatic pressure relief as system pressure rises
The SBV Type 11/Type 12 safety relief valve is designed to automatically release gas from a pressurised pipe as soon as the pressure in the system to be protected rises to and exceeds the set response pressure. If the system pressure subsequently falls below the closing pressure, the valve closes again automatically.
The SBV is designed for gases in accordance with DVGW Worksheet G260 and non-corrosive gases. Special versions are available for other gases.
For Type 11, W2 specifies an operating range of 0.03 to 8.0 bar, a permissible pressure rating of up to 25 bar and an operating temperature range of −15 to +60 °C. The valve can be installed in any position; the outlet must be vented to the open air.
0.03–8.0 bar for Type 11
Six defined spring ranges.
Up to 25 bar for Type 11
Permissible pressure rating.
−15 to +60 °C for Type 11
Documented operating range.
G1/2 connections for Type 11
For pipe Ø16 × 1.5.
Position-independent installation
Always route the outlet to the open air.
Gases in accordance with DVGW G260
For non-corrosive gases.
Advantages and versions of the SBV Type 11/Type 12
Automatic operation without auxiliary power
Low-maintenance design for Type 11
Special versions for other gases
Technical data for the SBV Type 11/Type 12 safety relief valve
The key specifications for preliminary selection – ranging from the operating range and permissible pressure rating of Type 11 to the medium, connection and installation position.
Design and operation of the SBV Type 11/Type 12 safety relief valve
Diaphragm, set-point spring and valve
The safety relief valve operates using a spring-loaded diaphragm. The components essential to its operating principle include the diaphragm and diaphragm plate, the set-point spring and spring plate, and the valve with its seal and adjustment spindle.
The pressure to be controlled enters beneath the diaphragm via the inlet. The set-point spring exerts a force on the diaphragm and, depending on its setting, determines the pressure at which the valve responds. On the Type 11, the setting is adjusted using the cross-handle.
How the safety relief valve works
If the pressure to be controlled rises to such an extent that the force acting on the diaphragm overcomes the set spring force, the diaphragm lifts together with the valve. This allows the gas to be vented via the outlet.
If the pressure subsequently falls below the value required for closure, the spring moves the valve back to the closed position. The safety relief valve therefore operates in a direct-acting manner and without external power.
The outlet of the safety relief valve must be vented to the atmosphere. On the Type 11, the inlet and outlet are designed as G1/2 connections for Ø16 × 1.5 tubing; venting is via a G1/4 connection for Ø12 × 1.5 tubing.
Technical design and enquiries regarding the SBV Type 11/Type 12 safety relief valve
The following factors are particularly relevant when selecting the appropriate model: the required set pressure, the maximum system pressure, the medium, the operating temperature, the required relief capacity, the connection type and the installation conditions.
Please send us the set pressure, system pressure, medium and required venting capacity so that we can make the technical selection of the SBV.