Application:- Pressure Relief Valve (P.R.V.) is a safety device to used in Transformer, Pressure Tanks & Lines for indoor & outdoor application. Suitable for repeated operation, than conventional Explosion Vent.
Mounting
P.R.V. can be mounted both horizontally & vertically by help of 4 mounting holes in Aluminum Casted Body for M10 Bolts at p.c.d. of 85 mm.
Working
Port of approximately 26 mm. is sealed by Diaphragm resting on an “O” Ring. Heavy- Duty Steel Spring Set keeps the port closed in normal condition. As soon as the pressure exceeds the pre determined safe limit due to any reason like change in temperature, formation of vapor etc. The diaphragm gets lifted from the seat. This exposes the tank pressure to a greater area, corresponding to the diameter of side gasket, thus sudden increase of force. Thus instantaneously opens port of 26 mm. and allowing vapor, gas & liquid to flow out of tank. This results to pressure fall. The diaphragm restores its normal position as soon as pressure drops below the set limit and is ready for second jump. Spring retainer prevents the dislocation of spring during repeated operation. Lift of diaphragm also operates the Limit Switch (Double Pole/ Double Throw type) &Visual Indicator (Flag) by help of Rod. Limit Switch is attached with ¾ “* 16 T.P.I. (B.S.C.) Cable Gland of PVC.
Engineered for rugged use & long life each P.R.V. is checked for its operational condition individually. It is important to note that depending upon the tank fluid different “O” Ring material is suggested. This design if used in transformer is suitable for operating pressure 0.42 / 0.49/ 0.56/ 0.63/ 0.70 kg/cm sq. (±0.07 Kg / cm sq.) i.e. 6 / 7 / 8/ 9/ 10 ± 1 p.s.i.
Note: - Our standard feature is PRV with Nitrile Rubber Gasket.
- Limit Switch confirms to weather protection IP-67 with (1 N.O.+ 1 N.C.) / (2 N.O.+ 2 N.C.) Contact
Different Models available are
- Without Electrical Contact & Visual Indicator (DP-1)
- With (Electrical Contact (1 N.O.+1N.C.) & Visual Indicator) (DP-1EF 1)
- With (Electrical Contact (2 N.O.+2N.C.) & Visual Indicator) (DP-1EF 2)
- These models are also available with VITON Rubber Gasket, suitable for Silicone Oil.
- Models are also available with Push Pull Electrical Connection.(1NO.+1NC) / (2NO+2NC).
- Vent screw for bleeding air or gas bubbles.
- PRV at different operating pressure (higher/lower) can be supplied as per your request.
Routine Test-is carried on each P.R.V. as follows and test certificate furnished along with supply.
- Operating Pressure individually.
- Contact / Operation of Switch & Flag is checked in Before & After Valve Operation condition.
- Leakage Test at 70% of Operating Pressure for 12 hr is done.
- Dielectric Test of 2KV. for 1 minute.
P.R.V. satisfies Environmental Test IP 67 Test Condition.
Due to our policy of continuous product improvement, dimensions and design are subject to change.
