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DESCRIPTION

Overview

Basic Info.

Model NO.	ZDM
Function	Non Return
Sealing Form	Self Tight Pressure Sealing
Flow Direction	Unidirection
Standard	ANSI
Application	Industrial Usage, Water Industrial Usage
Transport Package	Plywood Case
Trademark	GOOLE, OEM, ODM
Origin	China(Mainland)
HS Code	8481804090
Production Capacity	10000PCS/Year

Product Description

ZDM Automatic Recirculation Pump Protection ValveProduct Description

ZDM series automatic circulation pump protection valve is a pump protection device. It automatically protects some of the cavitation damage and instability that may occur in the pump body during the low load operation of the centrifugal pump (especially for conveying hot water medium). Once the pump flow is lower than the preset flow, the bypass is fully opened to ensure that the pump requires the minimum flow. Even if the main road is completely closed, ie the main road flow is zero, the minimum flow can also be automatically cycled through the bypass. Pressure is reduced by the integrated multi-stage throttle relief valve in the bypass. The ZDM series has a bypass suitable for high differential pressure, and the pressure difference is up to 30 MPa. The specific choice is determined by the factory. The multi-stage pressure-reducing M-type bypass bypasses the noise generated by high-speed flowing media and prevents cavitation and flashing from damaging valve components.Working Principle

The principle of action:

Automatic return three-way valve Based on the sensed main flow, the main valve flap of the automatic recirculation pump protection valve will automatically move to a certain position: At the same time, the main valve flap drives the bypass valve stem to transmit the main valve flap to the bypass. By controlling the position of the bypass valve flap, the throttling flow area of the bypass is changed, thereby controlling the flow through the bypass. When the main valve flaps back to the seat closed state, all flow bypasses the return flow. When the main flap is raised to the top position, the bypass is completely closed and all pumps flow to the process system. The valve combines four functions in one.
Flow-aware: The main valve of the automatic recirculation valve automatically senses the main flow in the process system and is therefore based on this flow. Position the main and bypass valve flaps.
Recirculation control: The automatic recirculation pump protection valve sucks in the minimum flow required for the normal operation of the pump through the bypass. In the storage device, the H-Q characteristics of the water pump are adjusted to achieve recycling.
Bypass multi-stage depressurization: The bypass control system reduces the backwash medium from the high pressure at the pump outlet to a moderate backflow with low noise and wear. Low voltage in storage device.
Non-return: The automatic recirculation valve also has a check valve to prevent liquid from flowing back into the pump body. Standard bypass with check function.
Other bypass sizes can be made as required; the maximum bypass flow rate depends on the maximum Kv value.Specification

ZDM Automatic Recirculation Pump Protection Valve

Pump protection valve Automatic recirculation for protection of the pump's minimum flow (automatic return three-way valve) ZDM automatic recirculation pump protection valve
The minimum flow valve is set to prevent vaporization of the feed pump. The set value is generally provided by the manufacturer. When the inlet flow of the feed pump is lower than the minimum value, the minimum flow valve is opened. If the flow is lower than the minimum flow, the jump pump is protected. Water pump. The minimum flow valve is also called the feed pump recirculation door. The outlet enters the deaerator and enters the feedwater system through the feed pump.Product Features

ZDM Automatic Recirculation Pump Protection Valve features:

Anti-cavitation multi-stage depressurization bypass reduces the flow rate and is suitable for high-pressure operation
Forged body, optional carbon steel or stainless steel
Standard bypass with check function, maximum working pressure difference up to 30MPa
This valve does not have any drive method.Product DetailsProduct Parameters

Valve brand	GOOLE
Valve Model	HDTM
Connection form	flange; welding
Product material	Forged steel A105/F304
Nominal diameter	DN40~DN500
Adapt to medium	water, steam, etc
Pressure rating	PN16-PN420

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