Manufacturer:  Fushiman Co.,LTD.
Model: PMD31P/LP And PLG61-2P

PMD31P Type Pressure Reducing Valve for Gas

PMD31LP Type Pressure Reducing Valve for Gas

PLG61-2P Type Pressure Reducing Valve for Gas

PMD31P Type Pressure Reducing Valve for Liquid Use

New Product

• Maintains the characteristics of a self-operated pressure reducing valve that responds sensitively and accurately to load fluctuations while achieving an offset comparable to other valves.
• Compared to conventional models, it offers an increase in nominal flow rate (Cv value) (our company’s product). However, considering pipeline flow velocity, the Cv value remains the same as conventional products with the same nominal diameter.
• Can be installed on existing valves, allowing for easy performance improvement.
• Useful when replacing self-operated valves in large-scale systems while maintaining adjustment accuracy.
• Can also be used for applications such as back pressure and steam control in vacuum and low-pressure pressure reducing valves.

The hybrid pressure reducing valve achieves control precision comparable to other valves by simply adding an innovative pilot controller to a conventional self-operated pressure reducing valve.

In conventional self-operated pressure reducing valves, achieving both minimal offset and high adjustment accuracy can be challenging. Additionally, when pressure reduction through self-operated control becomes complex, or when simplified installation with highly precise pressure reduction is desired, the hybrid pressure reducing valve is the optimal solution.

1. Type of Equipment

1.1 Hybrid Pressure Reducing Valve

1.2 CP1 Model Pilot Controller (PC)

2. Operation Explanation

1. The Hybrid (HB) Pressure Reducing Valve consists of two components: the main valve, which controls pressure, and the pilot controller (PC), which adjusts the control fluid based on changes in secondary pressure. The pilot controller is supplied with a control fluid such as compressed air, and its output is connected to the main valve’s diaphragm chamber.

2. The main valve automatically adjusts its opening according to the secondary pressure, similar to a conventional pressure reducing valve. However, the opening fluctuates in response to pressure changes (smaller when fully open, larger when slightly open), which causes an offset.

3. The pilot controller operates by opening to release the control fluid externally when the secondary pressure is high and closing to send the control fluid to the main valve when the secondary pressure is low. Since the main valve and the pilot controller operate almost simultaneously, the secondary pressure remains stable even when load fluctuations occur.

3. Specifications and Materials

Note (1): The operating pressure varies depending on the set pressure.

4. Performance and Cv Value

Note (2): The values vary depending on the set pressure and the piping conditions before and after the valve.
Note (3): The values may increase depending on the main valve settings.

5. Structure, Dimensions, and Mass

5.1 Structure, Dimensions, and Mass of PMD31P and PMD31LP Models

Dimensions and Mass (mm, kg)

Note: Valve box materials made of bronze or cast stainless steel are also available.

5.2 Structure, Dimensions, and Mass of PLG61-2P Pressure Reducing Valve

Dimensions and Mass (mm, kg)

6. Piping Example

(mm)

(mm)

7. Precautions for Use

• Before use, please read the “Instruction Manual” carefully.
• When piping for operating air, always perform a blow operation before connection to completely remove scale and debris.
• Supply constant pressure operating air to the pilot controller (PC) using a pressure reducing valve with a filter.
• Ensure that the exhaust port of the pilot controller is not blocked.
• When using the PMD31P model with liquid, be sure to completely remove any trapped air inside at the start of water flow.