Festures of Pressure Relief Valve

• Accurate Pressure Control
• Fast Opening to Maintain Line Pressure
• Slow Closing to Prevents Surges
• Completely Automatic Operation

Pressure Relief Valve Working Principle

 

Inlet pressure water enters the lower cavity of the pilot valve diaphragm from the guide valve when the pressure in the pipeline exceeds the set pressure of the guide valve to make its pressure increase to open the guide valve, the main valve control room outwards drain under the effect of the inlet pressure water to open the main valve, it starts to discharge pressure. When the pressure in the pipeline drops to the set pressure, the pressure in the lower cavity of the guide valve diaphragm decreases, causing the guide valve closed. This results in increased water pressure from the guide pipe to the pilot valve, then to the main valve control room. The main valve plate closes and begins to hold pressure.

Pressure Relief Valve Installation and Commissioning

The pressure relief(sustaining) valve supports horizontal and vertical installation but should pay attention to the inlet and outlet direction of valve body water when installing. In general, one fire water supply system can only install one pressure relief valve. Within the operating pressure range of the spring specified in the nameplate, the opening pressure can be adjusted by rotating the adjusting screw to change the spring compression amount. For specific use, please consult ZECO Valve Group.

Pressure Relief Valve Material and Standard

Size Range: 2″~24″
Pressure Rating: 10bar ~ 25bar
Face to Face Dimensions: AMSE B16.10, EN558-1
Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2
Coating: Fusion Bonded Epoxy Coating
Inspection and Test: ISO 5208 / EN 12226-2

Festures of Pressure Reducing Control Valve

• Sensitive and accurate pressure control
• Adjustable static pressure and dynamic pressure
• Outlet pressure does not fluctuate with inlet pressure
• Full port, small fluid resistance

Pressure Reducing Valve Working Principle

 

When water flows through the valve, water flows into the main valve control chamber through the needle valve, and the outlet pressure is imposed on the pilot valve through the guide duct. When outlet pressure is higher than the set pressure of the pilot valve, the outlet pressure does not rise any more; when the outlet pressure of the valve reduces to the set pressure of the pilot valve, the pilot valve opens, water is discharged out of the control chamber. Because the water discharged from the pilot valve system is more than the water inflow, the pressure in main valve control chamber reduces. The inlet pressure forces the main valve open. In a stable state, the water inflow and discharged water of the control chamber are equal. The opening of the main valve keeps constant, with stable outlet pressure.

Pressure Reducing Valve Installation and Commissioning

For operation, adjustment and maintenance convenience, the pressure reducing valve is typically installed on a horizontal pipe along with a backup pressure reducing valve group. Every grade of spring of the pressure reducing valve  can only apply in a certain range of outlet pressure, and outlet pressure can be set only by adjusting the spring of pilot valve. For specific use, please consult ZECO Valve Group.

Pressure Reducing Valve Material and Standard

Size Range: 2″~24″

Pressure Rating: 10bar ~ 25bar

Face to Face Dimensions: AMSE B16.10, EN558-1

Flange End Dimension: AMSE B16.1/16.42, AS4087, EN1092-2

Coating: Fusion Bonded Epoxy Coating

Inspection and Test: ISO 5208 / EN 12226-2

Features of Surge Anticipating Valve

• Double pilot valve can sense low pressure waves and high pressure waves;
• Sensitive induction, quick control;
• Fast opening to maintain line pressure;
• Full port, small fluid resistance.

Surge Anticipating Valve Working Principle

Generally, sudden stop of the pump will produce huge pressure fluctuations, the pressure in the sampling tube will also fluctuate at this time. The low pressure pilot valve senses this initial pressure wave to open the drain so that the main valve opens to prevent high pressure fluctuations from returning from the system. The opened main valve drains high pressure waves into the atmosphere. The high pressure pilot valve induces high pressure waves which also open and keep the main valve open. When the system pressure is lower than the preset pressure of the pilot valve, the high-pressure pilot valve is closed, the pressure of the main valve control room is increased, and the main valve is closed to maintain the system pressure in the pilot valve preset pressure.

Surge Anticipating Valve Installation and Commissioning

Determine the high and low pressure settings, and adjust the pipeline pressure at low pressure settings. At this point, the low pressure pilot valve is set at the critical state of opening and closing and locking the nut. Adjust the pipeline pressure to the high pressure setting value, set the high pressure pilot valve to the critical state of opening and closing to lock the nut. For specific use, please consult Zeco Valve Group.

Surge Anticipating Valve Material and Standard

Size Range: 2″~12″
Pressure Rating：10bar ~ 25bar

Face to Face Dimensions: AMSE B16.10, EN558-1

Flange End Dimension:AMSE B16.5, AS4087, EN1092-2

Coating: WRAS approved Fusion Bonded Epoxy Coating

Inspection and Test: ISO 5208 / EN 12226-2