Consistent, high-quality instrumentation valves & fittings, gaskets, gauges and more!


Dartex products are mainly instrumentation accessories used for critical applications in the field of oil and gas, Petrochem, Chemical, Pharma, Food, Pulp & Paper and many more where pressure parameters are measured or monitored.

Different applications are:

Isolation (Throttling & ON-OFF)
Isolation & drain
Isolation & calibration
Differential pressure measurement


Dartex follows ISO 9001:2008 quality system for manufacturing and supply of all our products. The entire product range is certified under PED 97/23/EC. However different standards are used as mentioned below.

Raw material standards

ASTM A 105, ASTM A 182 F 304, 304 L, F 316, F 316 L
ASTM A 351
ASTM A 479-304, 304 L, 316, 316 L
ASTM A 312
NACE M R 0175 - latest version

Manufacturing & testing standards

MSS - SP 99 for instrument valves
MSS - SP - 110 for instruments ball valves
ASTM F1387 - Compression Fittings & Threaded Fittings
ASME B 16.5
ASME B 16.34
ANSI/ASME B 1.20.1

Testing Procedures

All Dartex products are tested as per the relevant standards for hydraulic and pneumatic pressure.


Each and every product is supplied with the certificates for the wetted parts and the pressure test. The general format is EN 10204 3.1.

ISO 9001 : 2015
ISO 9001 : 2015
PED - Fittings
PED - Fittings
PED - Pressure Accessories - Valves & Manifolds
PED - Pressure Accessories - Valves & Manifolds


All Dartex products are supplied with laser marking. The marking is done in accordance with MSS- SP -25.

Pressure Temperature Chart

Pressure temperature chart

Valve heads or bonnet assemblies

Valve heads or bonnet assemblies