CBM 1079 Water Pressure Reducing Valve 20K

Item	Description
Product Name	CBM 1079 Water Pressure Reducing Valve 20K
Certificates	ABS, LR, BV, DNV, RINA, CCS
FOB Price	Get Latest Price Now
Warranty	12 months (unless otherwise specified)
Place of Origin	China

Overview

1.1 BASIC PARAMETERS

TABLE 1

Nominal Diameter Dg (mm)	Flow Rate Q (m³/h)	Initial Pressure P1 (kgf/cm²)	Reduced Pressure P2 (kgf/cm²)
32	19	8 ~ 16	2 ~ 8
40	30	8 ~ 16	2 ~ 8
50	47	8 ~ 16	2 ~ 8
65	80	8 ~ 16	2 ~ 8
80	120	8 ~ 16	2 ~ 8

1.2 MAIN DIMENSIONS

(Dimensions shown in Figure 1 and Table 2)
Figure 1 Parts List: 1 Body, 2 Upper Bonnet, 3 Disc, 4 Stem, 5 Sealing Ring, 6 Lower Disc, 7 Lower Bonnet

TABLE 2 (Unit: mm)

Nominal Diameter Dg	Structural Dimensions			Inlet Flange						Bolts		Outlet Flange
	L	Hmax	H1	D	C	g	h	t	Quantity n	Thread dia.	D1	C1	g1	h1	t1	Quantity n	Thread dia.	Weight(Kg)
32	210	320	72	135	100	80	19	16	4	M16	135	100	80	19	16	4	M16	12.2
40	220	325	79	140	105	85	19	16	4	M16	140	105	85	19	16	4	M16	14.1
50	260	370	87	155	120	100	19	16	8	M16	155	120	100	19	16	4	M16	19.1
65	270	420	93	175	140	120	19	18	8	M16	175	140	120	19	18	4	M16	26.8
80	280	465	110	200	160	135	23	20	8	M20	185	150	130	19	18	8	M16	31.4

Marking Example:
Water pressure reducing valve with nominal diameter Dg 32, initial pressure P1 8~16, reduced pressure P2 2~8:
Reducing Valve 8-16/2-8-32 CBM1079-81

2. TECHNICAL REQUIREMENTS

2.1 MATERIALS FOR MAIN PARTS

TABLE 3

Part Name	Material Name	Material Grade	Standard No.
Body	Tin Bronze	ZQSn10-2	CB883-78
Lower Bonnet	Tin Bronze	ZQSn10-2	CB883-78
Disc	Tin Brass	HSn62-1	YB457-71
Stem	Aluminum Bronze	QAl 9-2	YB458-71
Upper Bonnet	Cast Steel	ZG 25-II	CB772-70
Sealing Ring	Medium-hard acid and oil resistant rubber	-	-
Gasket	Rubber	-	-

2.2 STRENGTH TEST

The valve body shall be subjected to a hydraulic pressure test of P3 = 24 kgf/cm² for strength and tightness. During the pressure holding period of 5 minutes, if there is no visible deformation or leakage, it is deemed qualified.

2.3 TESTS

After the product is assembled, sealing test and pressure reducing performance test shall be conducted. The test methods shall be in accordance with Clause 3.

2.4 FLANGE

The flange connection dimensions shall be in accordance with CBM1020-81.

2.5 ACCESSORIES

Each product should be provided with the following accessories: 1 adjusting spring, 1 diaphragm, 4 spare bolts. If the user requires additional parts and components, they shall be specified when placing the order.

3. ACCEPTANCE RULES AND TEST METHODS

3.1 ACCEPTANCE

The product shall be inspected and accepted by the factory quality inspection department, and a factory certificate shall be issued.

3.2 SAMPLING

The product shall be delivered in batches. For sampling, the valve size, batch size, items for sampling, and the test methods and acceptance rules shall be specified in the contract at the time of ordering.

3.3 SEALING AND PRESSURE REDUCING PERFORMANCE TESTS

These tests shall be carried out in accordance with the installation line diagram shown in Figure 2.
3.3.1 Sealing Test: The adjusting spring shall be fully relaxed, and stop valve ④ shall be closed. Then stop valves ② and ⑤ shall be opened, and water pump ① shall be started. The inlet pressure shall be adjusted to 16 kgf/cm², and its value shall be read from pressure gauge ③. The pressure rise on the reduced pressure side shall not exceed 1.6 kgf/cm².

TABLE 4

Nominal Diameter Dg (mm)	32	40	50	65	80
δ = ΔP2 / P2 × 100% ≤	7	9	14	17	22
Note: ΔP2 is the drop value indicated on pressure gauge ⑥ when the valve is fully closed. ΔP2 = P2 (Q=0) - P2 (Q=max).