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The provided text appears to be a technical specification sheet for vertical centrifugal pumps from the CRV series. Here's a breakdown of the key information:

### Product Overview

Product Series: CRV (Vertical Centrifugal Pumps)

Key Features:
- Centrifugal Pump Type: Vertical design.
- Applications: Suitable for various industrial applications where vertical space is limited.

### Technical Specifications

1. Permissible Fluids:
- The pumps are designed to handle a variety of fluids, though specific types are not listed in the excerpt.

2. Pump Design:
- Impeller Type: Radial.
- Shaft Orientation: Vertical.
- Number of Stages: Single-stage (CRV1) and three-stage (CRV3).

3. Performance Parameters:
- Power Range: From 0.37 kW to 2.2 kW for CRV1 models, with similar ranges for CRV1N and CRV3.
- Flow Rate: Not specified in the excerpt but typically varies based on model and application.

4. Electrical Specifications:
- Voltage Options:
- For power up to 4 kW: 3 x 380-400D/660-690Y V
- For power up to 2.2 kW: 1 x 220-230/240 V (optional)
- Frequency: 50 Hz.
- Protection Class: IP55.

5. Efficiency:
- Energy Efficiency Class: IE2 or IE3, indicating high efficiency.

6. Rotational Speed:
- Speed: 2900 RPM.

7. Construction and Protection:
- Shaft Sealing: Mechanical seal.
- Protection Degree: IP55 (dust-tight and protected against water jets).

8. Material Options:
- Standard materials include cast iron for the casing, with options for stainless steel or other materials based on application needs.

9. Model Variants:
- CRV1 and CRV3 models are available in various power ratings.
- CRV1N indicates a variant with enhanced corrosion resistance.

### Product Listings

- CRV1 Series: Single-stage pumps with power ranging from 0.37 kW to 2.2 kW.
- CRV1N Series: Similar to CRV1 but with improved materials for corrosive environments.
- CRV3 Series: Three-stage pumps, offering higher pressure capabilities.

### Example Models

- CRV 1-2A (74111001): 0.37 kW
- CRV 1-36A (74111022): 2.2 kW
- CRV 3-17A (74113014): 1.5 kW

### Applications

These pumps are typically used in industries such as chemical processing, water treatment, and oil & gas, where vertical space is limited and high efficiency is required.

This summary provides a comprehensive overview of the CRV series vertical centrifugal pumps based on the provided text. For detailed specifications or additional models, consulting the manufacturer's full product catalog would be necessary.