Specifications
The document outlines the specifications for single effect overcenter hydraulic valves made of carbon steel. These valves are available in sizes ranging from DN6 to DN20 and can handle pressures up to PN350. They are designed to operate within a temperature range of -20°C to +90°C and are galvanized for protection.

Valve Types and Connections
The valves are available with different end connections including BSP, NPT, and SAE standards. The pilot ratios offered are 8:1 and 11:1, with options for larger sizes and tamper-proof caps upon request.

Structure and Materials
The valves are constructed from carbon steel and are available in various configurations based on the type and way of the valve, ends, and material standards such as GAS DIN/ISO 228, BSP, NPT ANSI/ASME B1.20.1, and SAE J1926-1.

Performance and Adjustments
The valves feature pilot ratios of 4.25:1 and 6.25:1, with fluid viscosity and filtration standards adhering to ISO 3448 and ISO 4406 respectively. The standard seals are made of NBR with a steel cap for adjustment.

Dimensional and Flow Specifications
The document provides detailed dimensional data and flow specifications for each valve type, including maximum flow rates and weight. The company reserves the right to make dimensional changes without prior notice.

Product Codes and Weights
Each valve type is associated with a specific item code and weight, with flow rates specified in liters per minute and weights in kilograms and pounds.