Description
Self-action control valves of outlet pressure RD 102 V and RD 103 V are valves designed for medium pressure reducing and keeping it at required value. Such function is ensured by diaphragm exposed to infuence of observed pressure from one side and controlled by spring from the other side. Diaphragm´s deflection transfers to valve plug and when pressure drops in relation to increase of medium bleeding, then closing of valve is induced. Owing to pressure-balanced plug, value of outlet pressure is not influenced by changes of inlet pressure value. Regulator is equipped with manometers, according to which required outlet pressure value can be directly adjusted (within range of used spring) and read its actual value when operating. In case when required value of outlet pressure is within range of two spring ranges, it is more suitable to choose the range with lower values to ensure sensitivity of regulator. Version with inlet of reducing pressure from extraction from pipeline is supplied with impulse pipe.

Application
These valves have a wide range of application in heating, water industry, air-conditioning and ventilation for tmperature to 140^oC. They can be installed in regulation circuits, where reduction of medium pressure must be secured without the necessity of application of any other measuring device and energy supply.

Process media
Valves series RD 102 V, RD 103 V are designed for gases and liquids such as air, water, low-pressure steam (it applies to RD 102 only) and other media compatible with material of the valve inner parts (especially body, plug and diaphragm). This valve is not suitable for oil. Medium acidity and alkalinity should not exceed range of pH 4.5 to 9.5. To ensure long-term tightness of the valve, producer recommends to pipe a strainer in front of the valve into pipeline. In application where increase of reducing pressure above adjusted value could cause a considerable breakdown of a system, producer recommends to pipe a safety valve behind pressure regulator into pipeline.

Technical data

Series	RD 102 V	RD 103 V
Type of valve	Self-acting regulators of outlet pressure
Nominal size range	DN 15 to 50
Nominal pressure	PN 16
Body material	Bronze RG 5	Grey cast iron EN-JL1040 (GG 25)
Plug material	Brass
Sealing plug - seat	EPDM
Diaphragm material	EPDM
Operating temperature range	-5 to 130oC, peaking up to 140oC
Face to face dimensions	Acc. to DIN 3202-M1 (4/1982)	Acc. to ČSN EN 558-1 (3/1997)
Connection	Internally threaded coupling	Raised-faced flanges DIN 2543
Type of plug	Contoured, pressure-balanced
Flow characteristic	Linear
Kvs values	2 to 20 m3/hour
Outlet pressure setting range	0,025 to 0,1; 0.08 to 0,3; 0,2 to 0,65; 0,3 to 1,0 MPa

Name	Catal. No. / version	Format and size
Self-acting pressure regulator	01-01.1 / 03.03.GB	(*.pdf, 244 kB)  Download