3/4" Flanged Diaphragm Valve, UPVC/ CPVC

2 way PVC diaphragm valve is widely used in water treatment, chemical processing and pharmaceuticals, with 3/4 inch (DN20) flanged port. Low price manual diaphragm valve is available in UPVC and CPVC body material, PTFE diaphragm, best for flow and liquid control.

SKU: CCHN-FDV-DN20

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Delivery date: 6-25 days

Overview

CCHN flanged PVC diaphragm valve uses a flexible PTFE diaphragm that separates the valve's body from the flow path. This diaphragm is made of CPVC or UPVC which can withstand corrosive or acidic substances.

Specification

Model	CCHN-FDV-DN20
Size	3/4 inch (DN20)
Structure Type	Flanged Type
Diaphragm Valve Assembly	Parts	Material
	Diaphragm	PTFE
	Film	EPDM
	Valve Body	UPVC, CPVC
	Valve Plate	UPVC, CPVC, Steel, Stainless Steel
	Cover Limit	AS
	Stud	Steel, Stainless Steel
	Retaining Nut	FRPP
	Washer	FRPP
	Wheel	Alloy Material
	Platen	Steel, Stainless Steel
	Double-Headed Stud and Nut	Steel, Stainless Steel
	Bonnet	UPVC, CPVC
	Yoke Nut	Ht300 Steel
	Stem	Steel, Stainless Steel

Dimension (Unit: mm)

Flanged PVC diaphragm valve dimension DN15 ~ DN100

Size	Valve Body Material	d	D	L	h	n-φ
3/4 inch (DN20)	UPVC	76	102	135	19	4-φ14
3/4 inch (DN20)	CPVC	76	102	135	19	4-φ14

Note: The above dimensions are for reference only, please refer to the actual product.

Detail

Flanged diaphragm valve detail

Working Pressure

Size	Working Pressure (MPa)
	UPVC			CPVC
	20~40℃	41~60℃	61~80℃	0~40℃	41~60℃	61~90℃
1/2" (DN15)	0.8	0.8	0.7	0.7	0.7	0.6
3/4" (DN20)	0.8	0.8	0.7	0.7	0.7	0.6
1" (DN25)	0.8	0.8	0.7	0.7	0.7	0.6
1-1/4" (DN32)	0.7	0.7	0.6	0.7	0.7	0.6
1-1/2" (DN40)	0.7	0.7	0.6	0.7	0.7	0.5
2" (DN50)	0.7	0.7	0.6	0.7	0.7	0.5
2-1/2" (DN65)	0.7	0.7	0.6	0.7	0.7	0.5
3" (DN80)	0.7	0.7	0.6	0.7	0.7	0.5
4" (DN100)	0.7	0.7	0.6	0.7	0.6	0.5
5" (DN125)	0.5	0.5	0.4	0.5	0.5	0.4
6" (DN150)	0.5	0.5	0.4	0.5	0.4	0.3
8" (DN200)	0.3	0.3	0.2	0.5	0.3	0.25
10" (DN250)	0.3	0.3	0.2	0.3	0.3	0.2

Tips: Difference between a bellow valve and a diaphragm valve

A bellow valve and a diaphragm valve are both types of control valves used in various industrial applications, but they differ in their design and operation.

A bellow valve utilizes a flexible metal bellow, which expands and contracts in response to pressure changes. When pressure increases, the bellow compresses, causing the valve to close, and when pressure decreases, the bellow expands, allowing the valve to open. Bellow valves are known for their ability to provide a tight seal and are commonly used in applications requiring high precision and reliability.

A diaphragm valve relies on a flexible diaphragm, usually made of rubber or elastomeric material, to control the flow of fluids. When pressure is applied to the diaphragm, it deforms and obstructs the flow path, closing the valve. Releasing pressure allows the diaphragm to return to its original shape, opening the valve. Diaphragm valves are often preferred for applications where a non-contaminating, zero-leakage solution is required, such as in the pharmaceutical and food industries.