Specifications:
The document outlines various series of piston pumps, including unidirectional and reversible cast-iron axial piston pumps. The pumps are available in different configurations such as ISO 4 bolt, UNI, SAE-B, and SAE-C, with displacements ranging from 21 cc to 108 cc. Specific series include HDS, DARK SAE-B, DARK, MDS, HDT, and TWIN FLOW, each with unique features and applications.

Procedures:
The document mentions the possibility of changing the direction of rotation for the pumps, indicating a level of customization available for different operational needs.

Norms and Standards:
The pumps adhere to various flange standards such as ISO, UNI, and SAE, ensuring compatibility with different systems and international standards.

Recommendations:
The document suggests using suction and delivery fitting kits to enhance pump performance. It also highlights the compact design of the HDT series, which is ideal for installations with clearance issues.

Key Data from Tables/Charts:
The document provides specific displacement values for each pump series, such as 53+53 cc or 70+35 cc for the TWIN FLOW series, and 84 cc, 96 cc, and 108 cc for the HDT series.

Critical Information:
The document emphasizes the versatility of the pumps, with options for both unidirectional and reversible operations, and the ability to handle high-pressure systems. The availability of by-pass valves and fitting kits is also crucial for optimizing performance.