971
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PRESSURE REGULATORS Process Management

971 Regulators Pressure Regulators This series of “Top-Entry” appliances was designed to meet a wide range of applications, offering easy maintenance. The main features are as follows: • Extremely high precision of the regulated pressure, even in the presence of highly variable inlet pressures • Easy adjustment of the delivery pressure by a simple replacement of the the control pilot setting spring • High versatility for a wide range of different applications Available Configurations 971 : Regulator 971-E : Monitor Also available version with type SR silencer.

971 Regulators Operation Pilot PS/79 Inlet pressure Motorization pressure Outlet pressure A Downstream or to a safe area How the Regulator Works The Diaphragm Unit (permanently connected to the shutter) divides the regulator control head into two chambers. One of the chambers is connected to regulated pressure (Pd), and the other to motorization pressure (Pm) produced by the pilot according to pressure downstream. Due to lack of pressure, the regulator spring acts on the diaphragm unit and closes the shutter. The shutter moves to its open position when the force produced by motorization...

971 Regulators Features Applications 971 type regulators are used in reduction, distribution and conveying stations of suitably filtered natural gas. They can also be used for air, propane, butane, LPG, city gas, nitrogen, carbon dioxide and hydrogen. Technical Features Flange rating ANSI 300/600 Allowable pressure Inlet pressure range Set range Min. operating differential press. Functional Features Accuracy class Lock-up pressure class Class of lock-up pressure zone Flanged connections Same Inlet and outlet: DN 250 Temperature Standard version Working: -10 °C +60 °C Low temperature version...

971 Regulators Calculation Procedures Symbols Sub-critical state with P2> Natural gas flow rate in Stm3/h Absolute inlet pressure in bar Absolute outlet pressure in bar Flow rate coefficient = 32500 Body shape factor = 31 Relative density of the gas P1 2 P1 Critical state with P2≤ 2 Gas Carbon dioxide For other gases with different densities, the flow rate calculated with the above formulas must be multiplied by the correction factor: Calculate the required Cg with the following formula: P1 Sub-critical state with P2> 2 Q Cg = Deg 3417 P1 - P2 0.525 ⋅ P1 ⋅ sin ⋅ P1 C1 P2≤ P1 2 Critical...

971 type regulators are equipped with the PS/ or PRX/ series pilots. Application Regulator or Monitor Operating Monitor Regulator Body and Covers Material 1/4” NPT female threaded connections All PS/ series pilots are supplied with a filter (5µ filtering degree) and built-in pressure stabilizer, with the exception of pilots PSO/79 and PSO/80. The SA/2 stabilizer filter must be used with PRX/ series pilots. SA/2 The stabilizer filter is equipped with a 5µ filtering degree filter and is suitable for heating. Model SA/2 Supplied Pressure Body and Covers Material Body and Covers Material 1/4”...

971 Regulators Silencers SR This silencer is fitted near the regulator shutter and is highly efficient up to a theoretical speed of 80 m/s calculated at the outlet flange. Beyond this speed could be necessary to act on the noise generated by the expansion cone usually installed downstream of the regulator. STP Dissipative silencer Habitually used down-stream of regulator can be combined with the SR silencer. The STP silencer consists of one or more porous channels clad with soundproofing material. Sound penetrates inside the soundproofing layer and is transformed into heat by friction. The...

Industrial Regulators LP-Gas Equipment Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Tescom Corporation Asia-Pacific Shanghai 201206, China Tel: +86 21 2892 9000 Middle East and Africa Dubai, United Arab Emirates Tel: +011 971 4811 8100 Asia-Pacific Singapore 128461, Singapore Tel: +65 6770 8337 Middle East and Africa Dubai, United Arab Emirates Tel: +011 971 4811 8100 For further information visit www.emersonprocess.com/regulators Our Global...