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Pressure Relief Valve

Pressure Relief Valves

General Information

This kind of Pressure Relief Valve (PRV) is a safety element of the transformer employs to prevent heavy damages of the tank in the case of sudden rise of the internal pressure. These Valve have been studied in order to remove the excess pressure in a very short time as soon as the pressure in the tank rises above predetermined safe limit the valve operates and allow the pressure to drop instantaneously, it avoids damage to transformer body.
Operating

The PRV's port is sealed with viton 'O' ring and sealing cap, kept sealed by stainless steel rod & stainless steel spring. The sealing cap is exposed to tank pressure, whenever same pressure rises due to any reason, the same pressure acts on the sealing cap from
inside. When pressure rises above predetermined safe limit, the sealing cap gets lifted from its seat. This lifting is instantaneous and allows vapours, gases or liquid to come out of tank. The sealing cap regains its position as soon as pressure in the tank drop below the set limit.
Model

S - 3 & S - 16 is provided with weatherproof IP 67 limit switch with lever, visible mechanical indicator & rain guard. The visible indicator shows Normal (Green) / Abnormal (Red) condition of transformer. The switch & visible indicator is actuated by movement of sealing cap and switch to be reset manually, it automatically resets visible indicator. All PRV is provided with splash guard and drain plug to prevent oil to splash all over the transformer, and a safe passage to splashed oil when PRV operates.
Main Characteristic :

 Distribution Transformers Power Transformers
 Model : T - 10 Model : S-3 Model : S-16
 Material  Brass forged body & brass
 sealing cap.

 Sealing rubber (Vilton)

 Hardened steel spring
Alu. Diecast body, Splash guard & SS Sealing cap.

Sealing rubber (Viton)

Hardened steel spring
Alu. Diecast body, Splash guard & SS Sealing cap.

Sealing rubber (Viton)

Hardened steel spring
 Specification
 Port dia.  1* BSP 65 mm 150 mm
 Op. Pressure  0.30, 0.42, 0.49, 0.56, 0.70, kg/cm2 any one value as per order.
 Op. Tolerance  + 0.05 kg / cm2
 Op Time  Instantaneously
 Switch  Available on request
 Contact Rating  -AC415V 1.5 Amps DC 230 V 0.1 Amps
 No. of Contact  -1 No / 1 Nc (4 Terminal)
 Resetting
 Valve  AutomaticAutomaticAutomatic
 Switch  -ManualManual
 Indicator  -AutomaticAutomatic
 Over all Dia ( L x W x H )
 50 x 50 x 75 mm   150 x 150 x 200 mm 250 x 260 x 250 mm
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