LDM spol. s r. o. was founded by three partners in the middle of 1991. Since its independent establishment it has been, still is and will be focused on the production of industrial valves, especially control valves in pressure stages PN 16 to PN 500 and in dimensions DN 15 to DN 400.

We are ready to offer you products from the entire LDM range including valve specifications according to your requirements. The long-standing cooperation with LDM has set very good business conditions for our company.

Control and shut-off systems

RV10x1 RV 102 RV 103
Control valves DN 15 to 50, PN 16, Kvs 15 to 50 m 3 / hour
Description The control valves of the RV 102 series are two-way or three-way fittings with a threaded connection. The material of the body is bronze. The control valves of the RV 103 series are the same fittings in flanged design. The material of the body is gray cast iron. These valves are manufactured in the following design:
  • three-way control valve
  • Two-way reversing control valve
  • Two-way angle control valve
Valves in RV 102 and RV 103 versions are controlled by handwheel or electromechanical actuators from Siemens (Landis & Staefa), Johnson Controls, Honeywell, Belimo, Ekorex + and ZPA Nová Paka.
Usage The valves are designed for use in heating and air conditioning technology for temperatures up to 150 o C.
Working media The valves of the RV 102 and RV 103 series are designed to regulate the flow and pressure of liquids, gases and vapors without abrasive additives such as water, low pressure steam (applies only to RV 102), air and other media compatible with the body material and internal parts of the valve. Acidity, resp. the alkalinity of the medium should not exceed the pH range 4.5 to 9.5. For high-quality and reliable regulation, the manufacturer recommends installing a mechanical dirt filter in front of the valve.
RV1131 RV 113
Two-way and three-way control valves DN 15 to 150, PN 6 and 16, Kvs 1.6 to 360 m 3 / hour
Description Control flanged valves RV 113 R are two-way valves with pressure-relieved plug (except DN15 - 25) and high tightness, designed to regulate and close the medium flow. This design of the valves allows control at high pressure drops, even at low forces of the actuators used. Flange control valves RV113 M are three-way valves with mixing or distribution function with high tightness in both branches, designed to regulate and close the medium flow. With a unique flow characteristic LDMspline ® , optimized for the regulation of thermodynamic processes, they are ideal for use in heating and air conditioning systems. Flow characteristics, Kvs coefficients and leakage comply with international standards. Valves type RV 113 R are designed for connection of electric actuators from Siemens, Belimo, Ekorex and LDM.
Usage RV113 control valves are designed for use in heating and air conditioning technology.
Working media RV113 valves are suitable for use in devices where the regulated medium is water, air and other media compatible with the material of the body and internal parts of the valve in the range +2 to + 150 ° C. The sealing surfaces of the throttling system are resistant to common sludges and dirt of the medium, but in the presence of abrasive additives, it is necessary to place a filter in the pipeline in front of the valve to ensure long-term reliable function and tightness. The valves must not operate in conditions where there is a risk of cavitation. They are not suitable for steam or steam condensate.
Control and shut-off valves 300 line
Single-seat control and shut-off valves of a modular design that allows each valve to be adapted to the needs of the equipment for which it is intended. They are available in pressure classes PN 40 and 63 and in sizes DN 15 to 400. The valve connection is either flanged or welded. The fittings are designed primarily for use in heating, air conditioning, energy, gas and chemical industries. They are controlled by a handwheel, electromechanical or pneumatic drives.
RV3x0 RV / UV 3 × 0
Control and shut-off valves DN 15 to 400, PN 40 to 63, Kvs 0.01 to 1600 m 3 / hour
Description RV / UV 3 × 0 (Ex) control valves are single-seat valves designed to regulate and close the fluid flow. Due to the wide range of actuators used, they are suitable for control at low and high pressure drops under the most diverse operating conditions. Flow characteristics, Kvs coefficients and leakage comply with international standards. The valves are controlled by a handwheel, electromechanical actuators manufactured by ZPA Nová Paka, Regada, ZPA Pečky, Schiebel, Auma and pneumatic actuators manufactured by LDM, SPA Praha and Flowserve. Use RV / UV 3 × 0 valves are designed for use in heating and air conditioning technology, energy and chemical industry. RV / UV 3 × 0 Ex valves meet the requirements of II 1 / 2G IIB TX according to ČSN EN 13463-1 (6/2009) and ČSN EN 1127-1 (5/2008) and in conjunction with suitable actuators are intended for use in the gas industry and the chemical industry. Depending on the operating conditions, it is possible to use valves made of cast steel and austenitic stainless steel. Working media Valves of the RV / UV 3 × 0 series are intended for regulation (RV 3 × 0) resp. to close (UV 3 × 0) the flow and pressure of liquids, gases and vapors such as water, steam, air and other media compatible with the material of the body and internal parts of fittings. The valves of the RV / UV 3 × 0 Ex series are also designed to regulate and close the flow and pressure of technical and heating gases and flammable liquids. For quality and reliable regulation, the manufacturer recommends inserting a filter of mechanical impurities into the pipeline in front of the valve, or in another suitable way to ensure that the regulated fluid does not contain abrasive additives or other mechanical impurities.
RV3x2 RV 3 × 2
Pressure-relieved control valves DN 25 to 400, PN 40 to 63, Kvs 1.6 to 1600 m 3 / hour
Description RV 3 × 2 (Ex) control valves are single-seat valves with a pressure-relieved plug, designed to regulate the medium flow. This design of the valves allows control at high pressure drops, even at low forces of the actuators used. Flow characteristics, Kvs coefficients and leakage comply with international standards. Valves type RV 3 × 2 (Ex) are controlled by handwheel or electromechanical actuators manufactured by ZPA Nová Paka, ZPA Pečky, Regada, Auma, Schiebel and pneumatic actuators manufactured by LDM, SPA Praha and Flowserve.
Usage RV 3 × 2 valves are designed for use in heating and air conditioning, energy and chemical industries. RV 3 × 2 Ex valves meet the requirements of II 1 / 2G IIB TX according to ČSN EN 13463-1 (6/2009) and ČSN EN 1127-1 (5/2008) and in conjunction with suitable actuators are designed for use in the gas and chemical industries. industry. Depending on the operating conditions, valves made of cast steel and austenitic stainless steel can be used.
Working media RV 3 × 2 series valves are designed to regulate the flow and pressure of liquids, gases and vapors such as water, steam, air and other media compatible with the material of the body and internal parts of valves. The valves of the RV 3 × 2 series are also designed to regulate and close the flow and pressure of technical and heating gases and flammable liquids. For quality and reliable regulation, the manufacturer recommends inserting a filter of mechanical impurities into the pipeline in front of the valve, or in another suitable way to ensure that the regulated fluid does not contain abrasive additives or other mechanical impurities.

Control valves are valves used to regulate the flow and pressure of the flowing medium. In the three-way design, they are then used to mix or divide the flow of the medium.
Shut-off valves are used to close or shut off pipelines under all normal operating and non-operating conditions. When equipped with electric or pneumatic actuators, their use is mainly in automated plants. Emergency shut-off valves are control or shut-off valves equipped with an actuator with an emergency function to ensure safe shut-off of the valve in the event of a power failure.
In the LDM product range, these valves occupy the largest area of the product portfolio. They are available in pressure classes from PN 6 to PN 500, with a range of nominal clearances from DN 15 to DN 400. Valve designs can be two-way straight or corner valves, or with an extended outlet port. Three-way control valves are generally dimensionally symmetrical. The applications of these valves range from common applications in heating and cooling technology, to demanding applications in the conventional and nuclear power industry, to applications for aggressive media in the chemical industry, pharmaceutical industry and food industry.

Outlet pressure regulators

Pressure reducing valves or outlet pressure regulators are self-acting valves used to maintain a constant pressure of the medium at the outlet side of the valve. The whole process is ensured by maintaining the pressure balance on the diaphragm, in case the consumption of the medium stops, the valve is closed.
In the LDM product range, these products are available in PN 16 and PN 25 versions, the range of nominal clearances is limited to DN 50.The
use of pressure reducing valves is mainly in the heating industry and in industrial water and air distribution

RD1 RD 102 V RD 103 V
Direct-acting outlet pressure regulators DN 15 to 50, PN 16, Kvs 2 to 20 m 3 / hour
Description Direct-acting output pressure regulators RD 102 V and RD 103 V are fittings designed to reduce the pressure of the medium and keep it at a specified value. This is ensured by the diaphragm, which on the one hand is exposed to the effects of the monitored pressure and on the other hand actuated by a spring. The deflection of the diaphragm is transmitted to the valve plug and the valve opens when the pressure drops depending on the increased consumption. Thanks to the pressure-relieved plug, the value of the outlet pressure is not affected by changes in the inlet pressure. The regulator is equipped with a manometer, according to which it is possible to directly set the required pressure value (in the range given by the used spring) and to monitor its instantaneous value during operation. In cases where the value of the required pressure is in the area where the values ​​of the ranges of the individual springs overlap, it is more suitable to choose a spring with a lower range for greater sensitivity of the regulator. The version with reduced pressure inlet from the supply in the pipeline is supplied including the impulse tube for connection. Use These fittings are designed for use primarily in heating and ventilation for temperatures up to 140 ° C. They can be installed in all control circuits where it is necessary to ensure the reduction of the medium pressure, without the need to use any additional measuring equipment and without power supply. Working media RD 102 V, RD 103 V valves are designed for gaseous and liquid media, such as air, water, low-pressure steam (applies only to RD 102) and other media compatible with the used materials of internal parts of valves (especially bodies, plugs and diaphragms) . This version is not suitable for oil. Acidity, resp. the alkalinity of the medium should not exceed the pH range 4.5 to 9.5. To ensure the long-term tightness of the valve, the manufacturer recommends installing a mechanical dirt filter in front of the valve. In applications where increasing the reduced pressure above the set value could cause a system failure, the manufacturer recommends including a safety valve behind the pressure regulator.
RD122V BEE line RD 122 V Direct-acting outlet pressure regulators DN 15 to 50, PN 25, Kvs 0.63 to 32 m 3 / hour
Description The RD 122 V direct-acting outlet pressure regulator is a valve designed to reduce the medium pressure and keep it at the set value. This is ensured by the diaphragm being exposed to the effects of the outlet pressure in the pipe and, on the other hand, actuated by a spring. The deflection of the diaphragm is transmitted to the cone and when the outlet pressure increases, the valve closes. Thanks to the pressure-balanced plug, the value of the outlet pressure is not affected by the pressure conditions in the valve. In cases where the value of the required outlet pressure is in the area where the values ​​of the ranges of the individual springs overlap, it is more suitable to choose a spring with a lower range for greater sensitivity of the regulator.
Usage The fittings are designed for operation in common hot water and hot water control circuits in heating, as well as in operations with some characteristic properties of media, such as refrigeration and air conditioning. The maximum differential pressure on the valve must not exceed 1.6 MPa.
Working media RD 122 valves are suitable for use in devices where the regulated medium is water, air or low-pressure steam up to 1.0 MPa. They are also suitable for cooling mixtures and other non-aggressive liquid and gaseous media in the temperature range +2 o C to +150 o C, or in spec. design with cooling condensing sumps up to 180 o C. The sealing surfaces of the throttle system are resistant to common sludges and dirt of the medium, but in the presence of abrasive additives, it is necessary to place a filter in the pipeline in front of the valve to ensure long-term reliable function and tightness.

Differential pressure regulators

RDD1 RD 102 D RD 103 D
Direct-acting differential pressure controllers DN 15 to 50, PN 16, Kvs 2 to 20 m 3 / hour
Description The RD 102 D and RD 103 D direct differential pressure control valves are fittings designed to maintain a constant pressure difference or constant flow (when using an orifice plate) on the equipment. This is ensured by a diaphragm that is exposed to the effects of the inlet and outlet pressures of the device or orifice. The deflection of the diaphragm is transmitted to the valve plug and the valve closes when the pressure difference increases. Thanks to the pressure-relieved plug, the value of the differential pressure is not affected by the pressure conditions in the valve. The regulator can be equipped with manometers, on which it is possible to monitor the instantaneous values ​​of the inlet and outlet pressure and according to them to set the required value of the pressure difference (in the range given by the used spring). The standard design is without manometers and the regulator must be set according to the pressures, or flow rates, measured directly on the device. In cases where the value of the required differential pressure is in the area where the values ​​of the ranges of the individual springs overlap, it is more suitable to choose a spring with a lower range for greater sensitivity of the regulator. Impulse connection tubes are supplied as standard with the fittings for connection to the taps.
Usage These fittings are designed for use primarily in heating and air conditioning for temperatures up to 140 ° C and up to a maximum working overpressure of 1 MPa. They can be installed in all control circuits where it is necessary to ensure a constant pressure drop or flow on the device without power supply.
Working media RD 102 D, RD 103 D valves are designed for gaseous and liquid media, such as air, water, low-pressure steam (applies only to RD 102) and other media compatible with the used materials of internal parts of valves (especially bodies, plugs and diaphragms) . This version is not suitable for oil. Acidity, resp. the alkalinity of the medium should not exceed the pH range 4.5 to 9.5. To ensure the long-term tightness of the valve, the manufacturer recommends installing a mechanical dirt filter in front of the valve.
RD1221 BEE line RD 122 D and RD 122 P Direct-acting differential pressure regulators and direct-acting differential pressure regulators with flow restrictor DN 15 to 50, PN 25, Kvs 0.63 to 32 m 3 / hour
Description The RD 122 D direct-acting differential pressure controller is a fitting designed to maintain a constant pressure difference on a given device. This is ensured by the membrane being exposed to the effects of the inlet and outlet pressures of the device. The deflection of the diaphragm is transmitted to the cone and when the pressure difference increases, the valve closes. Thanks to the pressure-balanced plug, the value of the differential pressure is not affected by the pressure conditions in the valve. Direct-acting differential pressure regulator with flow limiter RD 122 P is a valve designed primarily to meet the requirements for limiting the maximum flow of equipment. This is ensured by a pair of plugs, one of which is user-adjustable to the setpoint and the other is controlled by the pressure difference by means of a diaphragm head. The deflection of the diaphragm is transmitted to the cone and when the pressure difference increases, the valve closes. Pressure-balanced plugs guarantee reliable function and stability of the set value in the entire range of static and differential pressures. In cases where the value of the required differential pressure is in the area where the values ​​of the ranges of the individual springs overlap, it is more suitable to choose a spring with a lower range for greater sensitivity of the regulator. Impulse connection tubes are supplied as standard with the valves for connection to the supply line. Use The fittings are designed for operation in common hot water and hot water control circuits in heating, as well as in operations with some characteristic properties of media, such as refrigeration and air conditioning. The maximum differential pressure on the valve must not exceed 1.6 MPa. The use of a differential pressure regulator with flow limitation is suitable where it is necessary to guarantee the nominal flow of the device at the same time as the maximum, eg limitation of the power of the sampling point during start-up, etc. Working media RD 122 valves are suitable for use in devices where the regulated medium is water, air or low-pressure steam up to 0.4 MPa. They are also suitable for cooling mixtures and other non-aggressive liquid and gaseous media in the temperature range + 2 ° C to + 150 ° C. The sealing surfaces of the throttling system are resistant to common sludges and dirt of the medium, but in the presence of abrasive additives, it is necessary to place a filter in the pipeline in front of the valve to ensure long-term reliable function and tightness.

Differential pressure regulators are self-acting valves used to maintain a constant pressure differential across the equipment. This is achieved by maintaining pressure balance in a control head fitted with a diaphragm and associated valve cone. LDM offers these valves in sizes DN 15 to 50 and in pressure classes PN 16 and PN 25. They can be equipped with a flow restrictor to ensure that the maximum flow through the system is limited. They are mainly used in cases of central heat supply on UT distribution lines, as balancing valves in locations with different layout pressures.