Cooler-Bypass Thermostat Valve, Size Q max = l/min, p max = bar Temperature-controlled, integral relief function Description These direct acting bypass thermostat valves are size, temperature controlled, high performance screw-in cartridges with an M7x mounting thread. They are intended to be installed directly in coolers or line-mounting body. Depending on the temperature of the oil, they route the flow either straight to tank or through the cooler. When the oil is cold (< C resp. < C), the connection P T is open (bypass), which means that the flow is directed to tank with minimal headloss and the oil warms up rapidly. After the changeover temperature is reached (> C resp. > C), the integral thermostat element closes the connection Temperature-dependent bypass control Integral pressure-relief function Oil warms up rapidly (cold-start phase) Direct-mounted in coolers or manifold blocks Low headloss Choice of various pressure settings Very good reproducibility Extremely reliable Very stable operation All exposed parts with zinc-nickel plating Can be fitted in a line-mounting body P T. The valve now directs the oil flow through the cooler. With the integral pressure-relief function, the bypass thermostat cartridge also safeguards the cooler by protecting it from any pressure peaks that may result from excessive flow rates. The maximum pressure is determined by the model that is selected. The cartridges are predominantly used in coolers in mobile as well as industrial applications. All external parts of the cartridge are zinc-nickel plated to DIN 979 and are thus suitable for use in the harshest operating environments. Symbol T s P Technical data General characteristics Designation Design Mounting method Tightening torque Size Weight Mounting attitude Ambient temperature range Description, value, unit cooler-bypass thermostat valve temperature-controlled, integral relief function, choice of maximum pressure setting screw-in cartridge M7x Nm ± % size, cavity type DU. kg unrestricted - C + C Reference: -P-7-EN- Issue: 9. /
Hydraulic characteristics Maximum operating pressure Maximum flow rate Nominal pressure ranges Temperature for start of control action Flow direction Description, value, unit bar l/min bar bar (only C) bar (only C) bar (only C) bar (only C) bar (only C) (other pressures - consult BUCHER) Optional C or C see symbol Hydraulic fluid HL and HLP mineral oil to DIN ; for other fluids, please contact BUCHER Hydraulic fluid temperature range Viscosity range Minimum fluid cleanliness Cleanliness class to ISO : 999 - C + C mm /s (cst), recommended... mm /s (cst) class // Performance graphs measured with oil viscosity mm /s (cst) p = f (T) Pressure drop v. temperature [ C / bar ] P7.ai p = f (Q) Pressure drop v. flow rate [ C / bar ] P.ai T = C Q = l/min T [ C] T = < C Q [l/min] p = f (T) Pressure drop v. temperature [ C / bar ] P9.ai p = f (Q) Pressure drop v. flow rate [ C / bar ] P7.ai T = C Q = l/min T [ C] T = < C Q [l/min] / -P-7-EN-/9.
p = f (T) Pressure drop v. temperature [ C / bar ] 9 P7.ai p = f (Q) Pressure drop v. flow rate [ C / bar ] 9 P7.ai T = C Q = l/min T [ C] T = < C Q [l/min] p = f (T) Pressure drop v. temperature [ C / bar ] P9.ai p = f (Q) Pressure drop v. flow rate [ C / bar ] P.ai T = C Q = l/min T [ C] T = < C Q [l/min] -P-7-EN-/9. /
p = f (T) Pressure drop v. temperature [ C / bar ] P.ai p = f (Q) Pressure drop v. flow rate [ C / bar ] P.ai T = 7 C Q = l/min T [ C] T = < C Q [l/min] p = f (T) Pressure drop v. temperature [ C / bar ] P.ai p = f (Q) Pressure drop v. flow rate [ C / bar ] P.ai Q = l/min T [ C] Q [l/min] p = f (T) Pressure drop v. temperature [ C / bar ] P.ai p = f (Q) Pressure drop v. flow rate [ C / bar ] P.ai T = 7 C Q = l/min T [ C] T = < C Q [l/min] IMPORTANT! Further pressure settings on request! / -P-7-EN-/9.
Dimensions & sectional view Installation information Ma = [Nm] ± % 7 Ø. IMPORTANT! When fitting the cartridges, use the specified tightening torque. No adjustments are necessary, since the cartridges are set in the factory. 9 M7x ATTENTION! Only qualified personnel with mechanical skills may carry out any maintenance work. Generally, the only work that should ever be undertaken is to check, and possibly replace, the seals. When changing seals, oil or grease the new seals thoroughly before fitting them. T Seals P Item Description O-ring, x,9 HNBR7 7 Application examples Manifold block with integral cooler-bypass thermostat valve V V P WDTUVA... s T -P-7-EN-/9. /
Ordering code Ex. W D T UV A - - - _ - W = directional valve, cartridge construction D = direct acting T = temperature-actuated (thermostat element) UV = pressure-relief function is incorporated A... Q = standard model - see relevant data sheets Z... R = special features - please consult BUCHER = response temperature of thermostat ~ C = response temperature of thermostat ~ C = pressure setting = p N = bar ( C and C) = pressure setting = p N = bar (only C) = pressure setting = p N = bar (only C) = pressure setting = p N = bar (only C) = pressure setting = p N = bar (only C) = pressure setting = p N = bar (only C) = for other pressure settings, please consult BUCHER = size J = HNBR seals (standard) (special seals - please consult BUCHER)... 9 = design stage (omit when ordering new units) 9 Related data sheets Reference (Old no.) Description -P- Cavity type DU -P-7 Line-mounting body, type GCUA (G / ) info.ch@bucherhydraulics.com www.bucherhydraulics.com by Bucher Hydraulics AG Frutigen, CH-7 Frutigen All rights reserved. Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual improvement, we reserve the right to amend the product specifications contained in this catalogue. Classification:..-... / -P-7-EN-/9.