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Speck pumpen VH 350 - User Manual

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Operating Instructions
VU / VH Series
VU 20 - 1600
VH 20 - 1600
Liquid Ring Vacuum Pumps
English translation of the original operating
instructions
Documentation
It is imperative to read the operating instruc-
tions prior to commissioning!
This document as well as all documents in-
cluded in the appendix is not subject to any
update service!
Subject to technical changes.
Speck Pumpen Vakuumtechnik GmbH
Regensburger Ring 6 – 8, 91154 Roth / Germany
PO Box 1453, 91142 Roth / Germany
Phone: +49 (0) 9171 809 0
Fax: +49 (0) 9171 809 10
E-mail: info@speck-pumps.de
Internet: www.speck-pumps.de
Issue:
10/2010
Supersedes issue:
06/2010
Doc./ Item no.:
1096.0799

Table of Contents

Questions and Answers

  • R
    Roy MontgomeryAug 16, 2025
    What to do if my Speck pumpen VH 350 Water Pump motor protection is triggered?
    • J
      Judy JacksonAug 16, 2025
      If the motor protection of your Speck pumpen Water Pump is triggered, it could be due to several reasons: * There may be a short-circuit in the motor winding. Check the motor winding. * The motor protection switch might not be correctly set or is defective. Check the setting or replace the switch. * The motor may be overloaded. Check and reduce the operating liquid flow rate. * There could be excessive backpressure in the outlet nozzle. Reduce backpressure. * There might be an excessive share of liquid in the suction flow. Reduce the share of liquid. * The suction-side fitting may be blocked. Open the suction-side fitting.
  • M
    mark60Aug 20, 2025
    Why is my Speck pumpen VH 350 Water Pump motor consuming excessive power?
    • K
      Kevin LopezAug 20, 2025
      Excessive power consumption in your Speck pumpen Water Pump motor can occur due to: * Motor overload: Check and reduce the operating liquid flow rate. * Excessive backpressure: Reduce backpressure in the outlet nozzle. * Excessive share of liquid: Reduce the share of liquid in the suction flow. * Blocked suction-side fitting: Open the suction-side fitting. * High density/viscosity: Use an operating liquid complying with the density recommended in the data sheet. * Impeller rubbing: Disassemble the pump and properly set the inter casing/impeller gap size. * Pump contamination/calcification: Flush, descale, or disassemble the pump and clean it.
  • H
    harrisonmichaelAug 23, 2025
    What to do if my Speck pumpen VH 350 Water Pump is leaking?
    • E
      Erica StephensAug 23, 2025
      If your Speck pumpen Water Pump is leaking, consider the following potential causes: * A defective shaft sealing. Replace the shaft sealing. * A defective casing sealing. Provide the vacuum pump with new sealing. * Worn-out casing components. Replace the affected components. * Loosened connecting screws or screw plugs. Tighten the screws and replace the sealing.
  • D
    dickersonmeaganAug 27, 2025
    Why is my Speck pumpen VH 350 Water Pump not producing vacuum?
    • R
      rojasleeAug 28, 2025
      If your Speck pumpen Water Pump is not producing vacuum, it could be due to: * A lack of operating liquid. Check the operating liquid supply. * A leak in the suction pipe. Check and seal the suction pipe and connections. * The wrong direction of motor rotation. Check the direction of rotation and swap the 2 phases if necessary.
  • M
    Marcus JohnsonAug 30, 2025
    Why is my Speck pumpen VH 350 Water Pump not running smoothly?
    • S
      Stephanie JohnsonAug 31, 2025
      If your Speck pumpen Water Pump isn't running smoothly, here are some possible causes: * Excessive operating liquid flow rate: Reduce the operating liquid flow rate. * Overload in the pipe system: Check the pipe connections, pump fixation, and bearing clearance of the pipe clamps. * Air pocket in the pipe: Change the pipe system layout. * Pump distorted/improperly adjusted: Check and re-adjust the pump. * Resonance vibrations in the pipe system: Check the pipe connections and, if required, use a compensator. * Imbalanced impeller: Balance or replace the impeller. * Deposits on the impeller: Clean or replace the impeller. * Defective pump or motor bearing: Replace the pump or motor bearing.
  • S
    samantharubioSep 7, 2025
    Why is my Speck pumpen VH 350 making a strange noise?
    • U
      umarquezSep 8, 2025
      Strange noises from your Speck pumpen Water Pump can result from: * Pump cavitation: Install an anti-cavitation valve or equip the suction pipe with a ventilation valve. * Excessive steam: Reduce the share of steam or provide for condensation upstream the vacuum pump. * Suction-side fitting closed: Open the suction-side fitting or provide for cavitation protection. * Excessive operating liquid flow rate: Reduce operating liquid flow rate.
  • K
    Keith EvansNov 11, 2025
    Why is my Speck pumpen VH 350 motor not starting?
    • E
      Elizabeth WhiteNov 11, 2025
      There are several reasons why the motor of your Speck pumpen Water Pump may not be starting: * A phase of the power supply could be interrupted. Check the power supply and the motor. * The motor protection switch may have tripped. Try switching it on. * The motor might be blocked. Inspect the motor. * There might be corrosion inside impeller/inter casing. Use rust remover to overcome the blockage of the pump. * Ice could be inside the pump. Carefully heat up and defrost the pump. * Contaminations or foreign bodies may be present inside the pump. Flush or disassemble the pump and clean it. * The pump may have calcified. Descale the pump. * The impeller could be blocked or defective. Correct the gap size of the inter casing/impeller or replace it. * The motor bearing may b...

Summary

Important Basic Information

Target Groups

Identifies the intended users and their responsibilities for operating the system.

Applicable Documents

Lists documents that must be consulted alongside the operating instructions.

Warnings and Symbols

Explains safety warnings, symbols, and their consequences for non-observance.

Terminology

Defines key terms used throughout the operating instructions for clarity.

Safety

Intended Use

Specifies the correct and authorized applications for the pump/aggregate.

Possible Misuse

Details potential incorrect uses that can lead to damage or danger.

General Safety Instructions

Provides essential safety rules to be followed before and during operation.

Residual Risks

Highlights inherent risks that remain even after safety measures are applied.

Special Risks

Addresses specific hazards related to potentially explosive areas and dangerous media.

Design and Functioning

Marking

Describes identification elements like nameplates and ATEX plates on the pump.

General Description

Provides an overview of the pump's series and basic construction.

Design and Functional Principle

Explains the internal workings and operating principle of the liquid ring vacuum pumps.

Shaft Sealing

Details the types and characteristics of shaft sealing systems used in the pumps.

Transport, Storage and Disposal

Transport

Covers procedures for unpacking, manual transport, and lifting with gear.

Storage

Provides guidelines for storing the pump/aggregate to prevent damage.

Preservation

Details the process of applying preserving agents for storage.

Removing Preserving Agent

Instructions for safely removing preserving agents before operation.

Disposal

Guidance on environmentally friendly disposal of the pump and its parts.

Set-up and Connection

Preparation and Site Requirements

Checks for ambient conditions, clearances, and installation site suitability.

Pump Installation Methods

Procedures for setting up the pump on foundations or surfaces.

Motor, Coupling, and Piping Installation

Mounting motor, aligning coupling, and planning pipe systems.

Electrical Connection

Procedures for wiring the motor and associated safety precautions.

Operation

Commissioning Preparations

Steps to prepare the pump for initial operation and necessary checks.

Commissioning and Operation

Procedures for switching on, off, and setting operating parameters.

Decommissioning and Standby

Procedures for taking the pump out of service and standby operation.

Maintenance and Servicing

Monitoring and Lubrication

Regular checks for operation and schedule for bearing lubrication.

Cleaning and Calcification Prevention

Methods for rinsing contaminants and preventing mineral deposits.

Pump Disassembly and Assembly

Step-by-step procedures for dismantling and reassembling the pump.

Troubleshooting

Troubleshooting Guide

Identifies common defects, their causes, and rectifications.

Technical Data

Operating Limit Values

Performance limits for pressure, temperature, density, and speed.

General Specifications

Data on weight, sound level, drive power, connections, and seals.

Special Data and Accessories

Permissible forces, lubricants, preserving agents, and accessories.

Appendix

Dimension Drawings

Visual representations of pump dimensions for various models.

Cross-sectional Drawings and Parts Lists

Detailed internal views and component lists of pumps.

Declarations and Certificates

Includes Certificate of Conformity and EC Declaration of Conformity.

Speck pumpen VH 350 Specifications

General IconGeneral
Max. differential pressure10 bar
Max Head100 m
Voltage230/400 V
Frequency50/60 Hz
StagesSingle stage
Max Flow Rate350 l/min

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