Support & Service

Yes, in terms of reducing energy loss by heat release. We offer Y's jacket, easily detachable insulation cover for each of our model.

Yes. Please allow a safety factor of 10 - 20 %.

There may be influence of foreign substance or condensate in piping. Installation of drain separator is recommended.

80 to 100 mesh is recommended.

The valve can face problems such as vibration or rapid drop of outlet pressure. Selecting pressure reducing valves with small offset and large Cv value, for example GP-2000, may provide better performance.

We offer models with wetted parts stainless steel such as GP-1000SS and GD-41, or all-stainless models such as GP-1000AS and GD-20.

The valve can be selected according to the flowrate and the pressure. Yoshitake also offers choices of materials, such as ductile cast iron, bronze and stainles steel. For drinking water, follow the local laws and regulations.

When using steam as heat source, latent heat can be used more effectively at low pressure, which contributes to energy saving.

FCD450 is safer than FC200 because it has higher mechanical strenght such as tensile strength. Yoshitake's integrated production system has enabled to control the cost and to use ductile cast iron as standard material.

Some models have sucessors or spacer kits available. Please contact us for details.

If pressure is reduced, fluid velocity rises in piping of the same nominal size. It is necessary to take measures such as enlarging piping nominal size.

The valve should be selected considering inlet pressure, outlet pressure and flow rate. Required Cv value can be calculated from these factors. Model GP-2000 is recommended for regulation at low pressure. However, attention has to be paid because selecting too large a valve will have disadvantages.

Using the external sensing type of valve gives many advantages, such as:
-Stable pressure control can be achieved even in the lines with the wide fluctuation in flow rate.
-Stable pressure control can be achieved since the pressure can be detected at the exact point where the pressure control is required.
-The pressure drop due to piping from the pressure reducing valve to the controlled point can be ignored.
GP-2000 features the external sensing function as its standard.

Reduction ratio is the ratio between inlet and outlet pressure of the valve. Generally it is expressed by the maximum ratio such as 10:1 or 20:1, etc. For example, if the inlet pressure is 2.0MPa and the outlet pressure is 0.1MPa, the pressure reduction ratio is 20:1. The rangeability is the ratio between rated flow and the minimum adjustable flow rate. The higher range ability means the wider control range of the flow rate, and it represents the high controllability of the valve.

Please refer to the manual of each model of pressure reducing valve.

Each pressure reducing valve has a characteristic called offset. Please refer to the catalog of each model.

A strainer on the inlet pipe (or a built-in strainer of the pressure reducing valve) might be clogged. Fluctuation of inlet pressure can also be the cause.

Because of the structure of pressure reducing valves, valve opening will be unstable and the outlet pressure cannot be controlled normally.

Yes. Please specify the set pressure at the time of ordering.

Some models can be installed both on horizontal and vertical pipes, but they should be installed upright to sideways and cannot be installed upside down.

Yes. Please contact us for details.

Yes. Please contact us for details.

Pressure reducing valves control outlet pressure and cannot control flow rate.

A bypass valve can be used for flushing at the initial operation of the piping, draining steam condensate. It is also possible to service the pressure reducing valve while keeping the water flow.

It depends on working conditions and environments.

Annual inspection is recommended.

Drain condensate from the steam pipe as much as possible. After long suspension, please check the valve before assuming operation.

No problem, but it is recommended to add a short pipe between them for easy maintenance.

They are set at our standard set pressure. (example: standard set pressure of GP-1000 is 0.1MPa.)

Please install a strainer on the inlet side if the pressure reducing valve does not have a built-in strainer.

Please keep the test pressure on the inlet side at 1.5 times of the working pressure or lower, and the test pressure on the outlet side at 1.2 times of set pressure of the pressure reducing valve or lower.

Please use the package material (expanded polystyrene) as insulation material.

Yes, please refer to the pressure characteristics chart.

For GD-46 and GD-25 series pressure reducing valves for individual water supply, please detach the pressure gauge after finishing pressure adjustment. Other pressure reducing valves can be used with a gauge attached.

Yes, but not in freezing condition.

Yes, they can.

Please refer to the pictures.

No, they have to be used on horizontal piping.

No, they cannot. Internal sensing type is available as an option. Please contact us for details.

GP-1000 and GP-2000 are certified with the Pressure Piping Components Manufacture Appraisal Regulation.

We recommend using a pressure reducing valve at 20 to 80% of its rated flow rate.

Replaceable except for some models. Please refer to the manuals.

0.5 to 5m, but 2m or shorter is recommended. Please install it in a downward slope.

Please install 2 pressure reducing valves to make two-stage reduction. The distance between them should be 3m or more.

Please install the pressure reducing valve at a location lower than the relief valve.

Please use the separator with flow velocity 30m/sec or less for steam and 15m/sec for air.