Z61Y Self sealing Forged Gate Valve

1、 Purpose and performance specifications

The self sealing forged gate valve Z61Y produced, also known as a power station specialized valve, is mainly suitable for cutting or connecting pipeline media on various systems in thermal power plants. Applicable media: Non corrosive media such as water and steam.

The characteristics of power station valves compared to other valve products are high temperature and pressure, unique self sealing design, and the higher the pressure, the more reliable the sealing. Due to the unique performance technology characteristics and working conditions, the product has also formed characteristics that cannot be replaced by other products.

The opening and closing component of the gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces, and the two sealing surfaces of the commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters. The gate of the wedge gate valve can be made into a whole, called a rigid gate; It can also be made into a gate that can produce slight deformation to improve its processability and compensate for the deviation of the sealing surface angle during the processing. This type of gate is called an elastic gate. When the gate valve is closed, the sealing surface can only rely on medium pressure to seal, that is, relying on medium pressure to press the sealing surface of the gate towards the other side of the valve seat to ensure the sealing surface is sealed. Most gate valves use forced sealing, which means that when the valve is closed, external force is used to forcefully press the gate plate towards the valve seat to ensure the sealing surface is sealed.

2、 Advantages

1. The use of a straight through structure with equal channel diameter greatly reduces the flow resistance coefficient and energy loss, and improves the service life and performance of the valve.

2. The middle chamber of the valve adopts a pressure self tightening sealing structure, with good sealing performance.

3. The sealing surface of the gate and valve seat is made of hard alloy overlay welding, which has good wear resistance, high temperature resistance, corrosion resistance, and scratch resistance.

4. The surface of the valve stem is treated with corrosion-resistant nitriding, which has good corrosion resistance and scratch resistance.

5. The structure of the opening and closing parts can be designed into different forms such as single board, double board, parallel double board, etc. according to user requirements.

3、 Design specifications

1. Design standards

Design and Manufacturing GB/T12234 ASMEB16.34

Structural length JB/T3595 GB/T15188 GB/T12221

Interface connection dimensions JB/T3595 GB/T12224

Inspection and Testing JB/T3595 MSS SP61

Pressure and temperature reference JB/T3595 ANSI B16.34

2. Main pressure levels of gate valves in high-temperature and high-pressure power plants

Nominal pressure 200, 250, 320

Working pressure P 54 100V, P 54 140V, P 54 170V

3. Relevant standards for gate valves in high-temperature and high-pressure power plants

JBT 3595-2002 General Requirements for Power Plant Valves

JB/T 5263-2005 Technical Conditions for Steel Castings of Power Plant Valves

JB/T 4018 Method for Compiling Valve Models in Power Plants

DL 959-2005 Guidelines for the Application of Safety Valves in Power Plant Boilers

DLT 531-1994 Technical Conditions for High Temperature and High Pressure Stop Valves and Gate Valves in Power Plants

DLT 641-2005 Electric actuator for power plant valves

DLT 850-2004 Power Station Piping

GB 10869 Technical Conditions for Regulating Valves in Power Plants

GBT 10868-2005 Power Plant Temperature and Pressure Reducing Valve

4、 Component materials

Valve body: WCB ZG20CrMoV A105 WC6 WC9

Inner part: 20 # 12Cr1MoV

5、 Installation

This series of valves should be installed vertically or horizontally.

6、 Precautions for maintenance, upkeep, and use

1. The valve should be stored in a dry and ventilated room, and both ends of the valve should be blocked.

2. Valves stored for a long time should be inspected regularly to remove dirt. Special attention should be paid to the cleanliness of the sealing surface to prevent damage.

3. Before installation, carefully check whether the valve markings match the usage requirements.

4. Before installation, the inner chamber and sealing surface of the valve should be inspected. If there is dirt, it should be wiped clean with a clean cloth.

5. After use, the valve should be regularly inspected, including the sealing surface of the main pipeline and the sealing surface of the bypass. If damaged or ineffective, it should be repaired or replaced in a timely manner.

7、 Main appearance