Control valves
Safety valves
SV405, SV405P, SV405X and SV406
Safety Valves
Local regulations may restrict the use of this product to below the conditions quoted.
In the interests of development and improvement of the product, we reserve the right to change the specification without notice.
© Copyright 2012
TI-P257-01
CH Issue 8
Description
The SV405, SV405P, SV405X and SV406 are full nozzle safety
valves for steam and air service in non-critical industrial processes
requiring low flow, low pressure and low temperature.
Available types and applications
The SV405 has a brass body, 304 stainless steel
nozzle and Viton 'O' ring seat seal as standard.
The SV406 has a stainless steel body, 316 stainless
steel nozzle and Viton 'O' ring seat seal as standard.
Both units have been designed to protect against
overpressure in general process applications such as
sterilisers, small compressors and pressure vessels.
The SV405X has a brass body, 316 stainless steel
SV405
and
SV406
nozzle and Viton 'O' ring seat seal as standard.
SV405X
This unit has been designed for applications where
SV405P
SV405
SV406
and
SV405X
enhanced corrosion resistance is required.
The SV405P has a brass body, 304 stainless steel
nozzle and Viton 'O' ring seat seal as standard. It is
available with screwed BSP connections only and
pressure ranges starting from 1.65 bar g. The SV405P
safety valve is not available unset.
This unit has a ring-pull device in place of a lever and
is recommended for installations where space is
limited.
Standards and approvals
Seat tightness complies with API standard 527.
This product fully complies with the requirements of the European
Pressure Equipment Directive 97 / 23 / EC, fall within Category 4 for
Group 2 gases and carries the mark.
Certification
The product is available with a maunfacturers Typical Test Report.
Note: All certification / inspection requirements must be stated at
the time of order placement.
Sizes and pipe connections
Inlet
Screwed 1⁄2" or 3⁄4" BSP taper male BS 21 R or NPT*
Outlet
Screwed 3⁄4" BSP parallel female BS 21 Rp or NPT*
* Please note that the SV405P is only available with BSP connections.
SV405P
Pressure/temperature limits
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Steam
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Set pressure range
Backpressure
Temperature
Pressure bar g
Maximum
10 bar g
Minimum 1 bar g (1.65 bar g for the SV405P)
Maximum
Viton seat
Overpressure
10% of set pressure
Minimum
-20°C
Maximum
+184°C
Steam
10%
Gas
10%
Steam, gas
10%
Performance data
Designed for a maximum cold hydraulic test pressure of 20 bar g
Blowdown limits
Derated coefficient
of discharge values
Steam, gas
0.78
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