Product Details

working principle:

When the pressure difference between the inlet and outlet of the main valve changes, the pressure difference at both ends of the pilot valve changes, and the opening of the pilot valve changes. When the pressure difference is large, the opening of the pilot valve becomes larger, the water leakage in the control room increases, and the pressure in the control room of the main valve decreases. , the opening of the main valve increases, and the pressure difference between the inlet and outlet of the main valve becomes smaller. On the contrary, when the pressure difference between the inlet and outlet of the main valve becomes smaller, the pilot valve opening becomes smaller, and the pressure in the main valve control chamber rises, pushing the main valve opening to decrease and causing the main valve pressure difference to increase. This negative feedback effect stabilizes the pressure difference between the inlet and outlet of the main valve at the set value. Setting the needle valve opening and pilot valve spring pressure can set the pressure difference between the inlet and outlet of the main valve.

Product applications and features:

Function: It can improve the utilization rate of the system, maintain a precise and constant value of pressure difference, and

It can minimize the noise of the system and the impact of excessive pressure difference on

Damage caused by equipment.

Application areas: construction, water treatment, etc.

Features:

1. Opening and closing without friction;

2. Top-mounted structure;

3. Reliable sealing performance;

4. Easy to operate;

5.Wide range of application.

Technical Parameters:

Nominal diameter: DN50-DN600

Nominal pressure: PN16, N25

Applicable temperature: 0C ~80C

Applicable medium: clear water

Minimum pressure difference: 0.1MPa

Design standard: JB/T 10674. -2006

Test standard: GB/T 13927- -2008

Liquid level control height: ≤150mm

Main material

1 Gray cast iron, ductile iron, carbon steel, stainless steel - valve cover,

2 Spring steel, stainless steel - spring

3 Gray cast iron, ductile iron, carbon steel, stainless steel - diaphragm pressure plate

4 Nitrile nylon reinforced rubber, EPDM nylon reinforced rubber diaphragm

5 2Cr13 ——Valve stem

6 Gray cast iron, ductile iron, carbon steel, copper, stainless steel - valve disc

7 Nitrile rubber, EPDM rubber - O-ring

8 Gray cast iron, ductile iron, carbon steel, stainless steel - O-ring pressure plate

9 Copper alloy, stainless steel - valve seat

10 Gray cast iron, ductile iron, carbon steel, stainless steel - valve body