Airlec RYP Precision Pressure Reducing Valve Selection and Maintenance

Complete guide for selection, installation, and maintenance of Airlec RYP series precision pressure reducing valves

In pneumatic systems, precision pressure reducing valves are key components that ensure stable and reliable working pressure for actuating components such as cylinders, pneumatic motors, valve positioners, etc. The RYP series precision pressure reducing valve launched by Schmalz or similar brands is widely used in automation assembly, packaging, robot grasping and other scenarios due to its diaphragm and pressure relief function, multiple interface sizes and output pressure range. However, when faced with issues such as shutdown replacement, selection errors, pressure fluctuations, or improper accessory matching, engineers often need a complete guide from parameters to practical operation.

This article is based on the original technical data of the RYP series, combined with practical engineering experience, to systematically sort out the technical specifications, flow characteristics, installation accessories, pressure gauge selection, and common troubleshooting methods of this series of pressure reducing valves, helping readers quickly complete equipment selection, old part replacement, and system optimization.

Overview and Technical Parameters of RYP Series Products

1.1 Product positioning

The RYP series is a precision pressure reducing valve with a diaphragm and a relieving feature. The so-called pressure relief function refers to the valve automatically opening the exhaust port to release excess pressure when the outlet pressure exceeds the set value due to downstream flow changes, thereby maintaining a constant output pressure. This feature is particularly important for applications that require precise pressure control, such as vacuum generators and precision grippers.

The valve locking device adopts rotary locking and supports padlock to prevent unauthorized personnel from making incorrect adjustments.

1.2 Overview of Technical Specifications

Parameter values

Temperature range -10 ° C~+50 ° C

Maximum input pressure 16 bar

Installation direction is arbitrary

Applicable medium: Compressed air (compliant with ISO 8573-1:2010), neutral gas

Body materials Grivory (PA66) and POM

Sealing material NBR

Internal parts made of galvanized steel, stainless steel, brass

1.3 Model coding rules

The RYP series models consist of the following parts:

RYP - Interface Specifications - Output Range - Pressure Gauge and Flow Options

Interface specifications: 14 (G1/4), 37 (G3/8), 38 (G3/8), 12 (G1/2). Among them, 37 and 38 are both G3/8 but correspond to different shell sizes Y1 and Y2, so it is important to distinguish them.

Output range: 01 (0.1~1 bar), 02 (0.1~2 bar), 04 (0.2~4 bar), 08 (0.5~8 bar), 10 (0.5~10 bar, standard), 16 (0.5~16 bar).

Pressure gauge and flow direction:

0: No pressure gauge, flow direction from left to right (standard)

1: No pressure gauge, flow direction from right to left

2: With pressure gauge, flow direction from left to right

3: With pressure gauge, flow direction from right to left

Selection example: RYP-14-10-2 represents G1/4 interface, with an output of 0.5-10 bar, equipped with a pressure gauge and flowing from left to right.

1.4 Flow rate and weight of each model

Model Interface Size Code Flow (Nl/min) Weight (kg)

RYP-14-xxx G1/4 Y1 2200 0.30

RYP-37-xxx G3/8 Y1 2200 0.29

RYP-38-xxx G3/8 Y2 5000 0.51

RYP-12-xxx G1/2 Y2 5000 0.49

Internal air consumption: All models have a flow rate of ≤ 2.6 L/min, indicating that the valve itself has low air consumption and is suitable for continuous operation.

Flow characteristics and pressure regulation capability

2.1 Interpretation of Traffic Curve

The original factory provided two sets of flow characteristic curves: one set corresponds to RYP-14 and RYP-37 (low flow), and the other set corresponds to RYP-38 and RYP-12 (high flow). When given an inlet pressure (such as 7 bar) and different outlet pressure settings (such as 2 bar, 4 bar, 6 bar), the corresponding flow rate can be obtained by looking up the curve.

Engineering meaning:

If the gas consumption of downstream equipment exceeds the rated flow rate of the valve at this pressure difference, the outlet pressure will significantly drop and cannot maintain the set value.

When selecting, the corresponding working point should be found on the flow curve based on the maximum gas consumption, ensuring a margin of 10-20%.

2.2 Hysterese delay

The hysteresis of a pressure regulator refers to the difference in output pressure between the boost and buck strokes at the same flow rate. The relatively small hysteresis curve of the RYP series indicates good repeatability in voltage regulation and is suitable for precision control. Excessive delay may lead to unstable cylinder movement or poor positioning repeatability.

Installation and accessory selection

3.1 Basic Installation Requirements

The RYP series can be installed in any direction, but it is recommended that the pressure gauge be facing upwards or horizontally for easy reading.

The input gas must be clean and dry. It is recommended to install a filter with a filtration accuracy of ≤ 5 μ m upstream (similar to a similar gas source processing unit).