Swing Type Check Valve

Swing Type Check Valve Specification

Standard: BS5153,DIN3202-F6,DIN3201-F1, AWWA C508

Flange drilling is according to BS4504, DIN2501, and ANSI B16.1

Working pressure: 10bar/16bar/25bar

Testing pressure:

Shell: 15bar/24bar/37.5bar

Seal: 11bar/17.6bar/27.5bar

Material: Ductile iron GGG40/50 or Cast IronGG25

Disc seat ring: Brass/Bronze/Stainless steel/ EPDM

Body seat ring: Brass/Bronze/Stainless steel

Bolt and Nuts: Carbon Steel with zinc plated or SS304,316

Coating: Internal and external with fusion bonded epoxy coating min250μm or Liquid Epoxy painting

Silent check valves significantly reduce opening and closing noise and water hammer effects through flexible buffering structures and shock-absorbing designs, making them suitable for noise sensitive scenarios that require stable fluid control. The following is an analysis of its typical application scenarios and advantages:

1、 Building plumbing and HVAC systems

1. High rise building water supply system

Scenario requirement: In the secondary water supply system of high-rise residential and office buildings, water hammer and noise are easily generated when the water pump starts and stops, which may damage the pipeline or affect the resident experience.

Advantages of Silent Check Valve: Multi flap or diaphragm valve flaps disperse the water flow impact force, avoiding the "bang" sound caused by the rapid closure of a single valve flap. The spring buffer device slows down the closing speed of the valve disc, reduces water hammer pressure, and protects the pipeline and water pump.

Case: A 30 story residential building adopts a silent check valve with a rubber sealing surface, reducing the noise in the water pump room from 85dB to 68dB and decreasing the resident complaint rate by 90%.

2. Central air conditioning water circulation system

Scenario requirement: In the air conditioning chilled water and cooling water pipelines, valve opening and closing noise may be transmitted indoors through the pipelines, affecting the office or living environment.

Advantages of Silent Check Valve: The flexible sealing material reduces the rigid impact between the valve disc and seat, reducing noise to below 50dB. The design of the diversion groove guides the smooth flow of water, reduces turbulent noise, and avoids unit failure caused by the backflow of chilled water.

2、 Medical and precision instrument fields

1. Hospital clean pipeline system

Scenario requirement: The pure water and gas pipelines in the operating room and laboratory need to be strictly controlled for noise, while preventing medium reflux pollution.

Advantages of Silent Check Valve: Made of stainless steel material and polished to meet cleanliness requirements, it prevents the growth of bacteria due to residual media. The diaphragm valve disc opens and closes through elastic deformation, without mechanical impact noise, and is tightly sealed to prevent the backflow of drugs and sterile gases.

2. Precision instrument cooling system

Scenario requirement: In the cooling cycle of semiconductor equipment and nuclear magnetic resonance instruments, small water hammer or noise may interfere with equipment accuracy.

Advantages of Silent Check Valve: The shock-absorbing structure and silencing chamber absorb fluid fluctuation energy, ensuring stable cooling water flow and noise levels below 35dB. The quick closing design prevents coolant backflow during shutdown and avoids local overheating of the instrument.

Silent check valves have become the preferred valve for balancing performance and environmental requirements in modern industrial and civilian fields due to their dual characteristics of "noise reduction" and "stable control", especially in scenarios where traditional check valves have prominent noise problems and are irreplaceable.