Stainless Steel Threaded Low Resistance Backflow Preventer

• Customization: Available
• Leakage Standard: Class IV or Class VI
• Flow Characteristic: Linear or Equal Percentage
• Model NO.: GALHS711X
• Connecting Type: Flange
• Material: Wcb, S.S 304, SS316, SS304L, SS316L
• Medium Temperature: - 20 Deg C to 150 Deg C
• Usage: Flow Control
• Type: Standard Type, Regulating Cutting Type, Bellow Sea
• Size: DN15-DN300
• Transport Package: Plywood Case
• Specification: CE, SGS, TUV
• Trademark: GOOLE, OEM
• Origin: Wenzhou, Zhejiang, China
• HS Code: 8481804090
• Production Capacity: 50000PCS/Year

Product Description

Stainless Steel Threaded Low Resistance Backflow Preventer

Product Description

The stainless steel low resistance backflow preventer is a DC type low resistance backflow preventer composed of a main valve, drain, detection valve, and additional facilities of a two-stage check device. Its structure ensures that the drain is effectively opened during backflow conditions, allowing the intermediate chamber to communicate with the atmosphere. In the event of sealing failure of the check valve and the entire machine seal, the leaked medium can flow to the intermediate chamber and be directly discharged outside the valve through the drain. This product has the characteristics of low noise, low flow resistance, smooth and sensitive operation, easy installation and maintenance, and long service life. It is suitable for conveying drinking water to prevent harmful and minor pollution.

Specification

STANDARD

The main valve of the two-stage check device for stainless steel low resistance backflow preventer is designed as an integrated structure with equal cross-sectional flow channels. The valve is equipped with an inlet check valve and an outlet check valve. The closing sealing force of the valve disc and seat of the two check valves comes from the pressure difference between the outlet section and the inlet section. After closing, under normal pressure at both ends of the inlet and outlet, it has a self sealing function and can ensure that the pressure in the middle chamber is zero. An air partition is formed between the inlet and outlet sections. The two valve discs are flexibly connected and linked by a connecting rod and an auxiliary spring. The two valve discs are reset by only one main push spring, which does not need to bear the sealing force and pressure between the valve disc and the valve seat. Differential force, which only overcomes the frictional force and self weight during the closing motion of the valve disc, can be designed to be relatively soft, So this main valve can ensure air isolation when closed, and effectively reduce head loss when opened.
 

Product Details

Materials:

Nominal size DN	Nominal pressure	Working pressure	L mm	D mm	D1 mm	D2 mm	n-Ф d mm	B mm	Weight kg/kilos
20	1.0	1.0	160	105	75	59	4-14	128
25			160	115	85	68	4-14	128
32			180	140	100	78	4-18	150	4.5
40			200	150	110	88	4-18	160	7
50			230	165	125	102	4-18	178	8
65			290	185	145	122	4-18	205	10
80			310	200	160	133	8-18	230	18
100			350	220	180	158	8-18	255	24
125			400	250	210	184	8-18	305	30.5
150			480	285	240	212	8-22	345	47.5
200			500	340	295	268	8-22	415	63.5
250	0.6	0.6	550	395	350	320	12-22	495	96.5
300		0.4	620	445	400	370	12-22	540	144
350			698	505	460	430	16-22	620	224
400			787	565	515	482	16-22	680

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